Army Corps of Engineers
History of the Lake Pontchartrain and Vicinity Hurricane Protection Project Gao ID: GAO-06-244T November 9, 2005The greatest natural threat posed to the New Orleans area is from hurricane-induced storm surges, waves, and rainfalls. A hurricane surge that can inundate coastal lowlands is the most destructive characteristic of hurricanes and accounts for most of the lives lost from hurricanes. Hurricane surge heights along the Gulf and Atlantic coasts can exceed 20 feet. The effects of Hurricane Katrina flooded a large part of New Orleans and breeched the levees that are part of the U.S. Army Corps of Engineers (Corps) Lake Pontchartrain, and Vicinity, Louisiana Hurricane Protection Project. This project, first authorized in 1965, was designed to protect the lowlands in the Lake Pontchartrain tidal basin from flooding by hurricane-induced sea surges and rainfall. GAO is providing information on (1) the purpose and history of the Lake Pontchartrain, and Vicinity, Louisiana Hurricane Protection Project and (2) funding of the project. GAO is not making any recommendations in this testimony.
Congress first authorized the Lake Pontchartrain and Vicinity, Louisiana Hurricane Protection Project in the Flood Control Act of 1965. The project was to construct a series of control structures, concrete floodwalls, and levees to provide hurricane protection to areas around Lake Pontchartrain. The project, when designed, was expected to take about 13 years to complete and cost about $85 million. Although federally authorized, it was a joint federal, state, and local effort. The original project designs were developed based on the equivalent of what is now called a fast-moving Category 3 hurricane that might strike the coastal Louisiana region once in 200-300 years. As GAO reported in 1976 and 1982, since the beginning of the project, the Corps has encountered project delays and cost increases due to design changes caused by technical issues, environmental concerns, legal challenges, and local opposition to portions of the project. As a result, in 1982, project costs had grown to $757 million and the expected completion date had slipped to 2008. In the mid-1980s, the Corps shifted to an alternative project design; however, this change did not affect the level of protection provided to New Orleans because the alternative design selected was expected to provide the same level of protection as the original design. When Hurricane Katrina struck, the project, including about 125 miles of levees, was estimated to be from 60-90 percent complete in different areas with an estimated completion date for the whole project of 2015. The floodwalls along the drainage canals that were breached were complete when the hurricane hit. The pre-Katrina estimated cost of construction for the completed project was $738 million with the federal share being $528 million and the local share $210 million. Federal allocations for the project were $458 million as of the enactment of the fiscal year 2005 federal appropriation. This represents 87 percent of the federal government's responsibility of $528 million with about $70 million remaining to complete the project. Over the last 10 fiscal years (1996-2005), federal appropriations have totaled about $128.6 million and Corps reprogramming actions resulted in another $13 million being made available to the project. During that time, appropriations have generally declined from about $15-20 million annually in the earlier years to about $5-7 million in the last three fiscal years. While this may not be unusual given the state of completion of the project, the Corps' project fact sheet from May 2005 noted that the President's budget request for fiscal years 2005 and 2006, and the appropriated amount for fiscal year 2005 were insufficient to fund new construction contracts. The Corps had also stated that it could spend $20 million in fiscal year 2006 on the project if the funds were available. The Corps noted that several levees had settled and needed to be raised to provide the level of protection intended by the design.
GAO-06-244T, Army Corps of Engineers: History of the Lake Pontchartrain and Vicinity Hurricane Protection Project
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Testimony:
Before the Committee on Environment and Public Works, U.S. Senate:
United States Government Accountability Office:
GAO:
For Release on Delivery Expected at 9:30 a.m. EST:
Wednesday, November 9, 2005:
Army Corps of Engineers:
History of the Lake Pontchartrain and Hurricane Protection Project:
Statement of Anu Mittal, Director, Natural Resources and Environment:
GAO-06-244T:
GAO Highlights:
Highlights of GAO-06-244T, a testimony before the Committee on
Environment and Public Works, U.S. Senate:
Why GAO Did This Study:
The greatest natural threat posed to the New Orleans area is from
hurricane-induced storm surges, waves, and rainfalls. A hurricane surge
that can inundate coastal lowlands is the most destructive
characteristic of hurricanes and accounts for most of the lives lost
from hurricanes. Hurricane surge heights along the Gulf and Atlantic
coasts can exceed 20 feet. The effects of hurricane Katrina flooded a
large part of New Orleans and breached the levees that are part of the
U.S. Army Corps of Engineers (Corps) Lake Pontchartrain, and Vicinity,
Louisiana Hurricane Protection Project. This project, first authorized
in 1965, was designed to protect the lowlands in the Lake Pontchartrain
tidal basin from flooding by hurricane-induced sea surges and rainfall.
GAO is providing information on (1) the purpose and history of the Lake
Pontchartrain, and Vicinity, Louisiana Hurricane Protection Project and
(2) funding of the project.
GAO is not making any recommendations in this testimony.
What GAO Found:
Congress first authorized the Lake Pontchartrain and Vicinity,
Louisiana Hurricane Protection Project in the Flood Control Act of
1965. The project was to construct a series of control structures,
concrete floodwalls, and levees to provide hurricane protection to
areas around Lake Pontchartrain. The project, when designed, was
expected to take about 13 years to complete and cost about $85 million.
Although federally authorized, it was a joint federal, state, and local
effort.
The original project designs were developed based on the equivalent of
what is now called a fast-moving Category 3 hurricane that might strike
the coastal Louisiana region once in 200-300 years. As GAO reported in
1976 and 1982, since the beginning of the project, the Corps has
encountered project delays and cost increases due to design changes
caused by technical issues, environmental concerns, legal challenges,
and local opposition to portions of the project. As a result, in 1982,
project costs had grown to $757 million and the expected completion
date had slipped to 2008. In the mid-1980s, the Corps shifted to an
alternative project design; however, this change did not affect the
level of protection provided to New Orleans because the alternative
design selected was expected to provide the same level of protection as
the original design. When Hurricane Katrina struck, the project,
including about 125 miles of levees, was estimated to be from 60-90
percent complete in different areas with an estimated completion date
for the whole project of 2015. The floodwalls along the drainage canals
that were breached were complete when the hurricane hit.
The pre-Katrina estimated cost of construction for the completed
project was $738 million with the federal share being $528 million and
the local share $210 million. Federal allocations for the project were
$458 million as of the enactment of the fiscal year 2005 federal
appropriation. This represents 87 percent of the federal government‘s
responsibility of $528 million with about $70 million remaining to
complete the project. Over the last 10 fiscal years (1996-2005),
federal appropriations have totaled about $128.6 million and Corps
reprogramming actions resulted in another $13 million being made
available to the project. During that time, appropriations have
generally declined from about $15-20 million annually in the earlier
years to about $5-7 million in the last three fiscal years. While this
may not be unusual given the state of completion of the project, the
Corps‘ project fact sheet from May 2005 noted that the President‘s
budget request for fiscal years 2005 and 2006, and the appropriated
amount for fiscal year 2005 were insufficient to fund new construction
contracts. The Corps had also stated that it could spend $20 million in
fiscal year 2006 on the project if the funds were available. The Corps
noted that several levees had settled and needed to be raised to
provide the level of protection intended by the design.
www.gao.gov/cgibin/getrpt?GAO-06-244T.
To view the full product, including the scope and methodology, click on
the link above. For more information, contact Anu Mittal at (202) 512-
3841 or mittala@gao.gov.
[End of section]
Mr. Chairman and Members of the Committee:
We are pleased to be here today to discuss the U.S. Army Corps of
Engineers (Corps) Lake Pontchartrain, and Vicinity, Louisiana Hurricane
Protection Project. This project, first authorized in 1965, was
designed to protect the lowlands in the Lake Pontchartrain tidal basin
within the greater New Orleans metropolitan area from flooding by
hurricane-induced sea surges and rainfall. As you know, the effects of
Hurricane Katrina breached the levees that are part of this project and
flooded a large part of New Orleans. In my testimony, I will discuss
(1) the purpose and history of the project and (2) funding of the
project. This statement is based on GAO's past reports on the Lake
Pontchartrain and Vicinity, Louisiana Hurricane Protection Project and
on the Corps' flood control efforts in general, which we updated as
necessary.[Footnote 1]
In summary, the Lake Pontchartrain hurricane project was designed to
protect areas around the lake from flooding caused by a storm surge or
rainfall associated with a standard project hurricane, which is roughly
the same as what is now classified as a fast moving Category 3
hurricane. The project, when designed in the mid-1960s, was expected to
take about 13 years to complete and cost about $85 million. Over the
years, the project has undergone some significant design changes as a
result of a successful court challenge, local opposition to certain
aspects of the proposed design, and changed Corps thinking about the
most cost-effective approach. None of these changes, however, affected
the level of protection provided to New Orleans because the alternative
design selected was expected to provide the same level of protection.
As of early 2005, the project was not expected to be completed until
2015--nearly 50 years after it was first authorized--and cost about
$738 million, much of the cost increase is due to inflation over the
years and changes to the scope and design of the project. In recent
years, questions have been raised about the ability of the project to
protect the New Orleans area from hurricanes greater than Category 3.
This issue was only beginning to be studied by the Corps when Hurricane
Katrina hit the area in August 2005.
Background:
Since its founding in 1718, the city of New Orleans and its surrounding
areas have been subject to numerous floods from the Mississippi River
and hurricanes. The greater New Orleans metropolitan area, composed of
Orleans, Jefferson, St. Charles, St. Bernard, and St. Tammany parishes,
sits in the tidal lowlands of Lake Pontchartrain and is bordered
generally on its southern side by the Mississippi River. Lake
Pontchartrain is a tidal basin about 640 square miles in area that
connects with the Gulf of Mexico through Lake Borgne and the
Mississippi Sound.
While the area has historically experienced many river floods, a series
of levees and other flood control structures built over the years were
expected to greatly reduce that threat. The greatest natural threat
posed to the New Orleans area continues to be from hurricane-induced
storm surges, waves, and rainfalls. Several hurricanes have struck the
area over the years including Hurricane Betsy in 1965, Hurricane
Camille in 1969, and Hurricane Lili in 2002. The hurricane surge that
can inundate coastal lowlands is the most destructive characteristic of
hurricanes and accounts for most of the lives lost from hurricanes.
Hurricane surge heights along the Gulf and Atlantic coasts can range up
to 20 feet or more and there is growing concern that continuing losses
of coastal wetlands and settlement of land in New Orleans has made the
area more vulnerable to such storms. Because of such threats, a series
of control structures, concrete floodwalls, and levees, was proposed
for the area along Lake Pontchartrain in the 1960s.
Purpose and History of the Lake Pontchartrain and Vicinity Flood
Control Project:
Congress first authorized construction of the Lake Pontchartrain and
Vicinity, Louisiana Hurricane Protection Project in the Flood Control
Act of 1965[Footnote 2] to provide hurricane protection to areas around
the lake in the parishes of Orleans, Jefferson, St. Bernard, and St.
Charles. Although federally authorized, it was a joint federal, state,
and local effort with the federal government paying 70 percent of the
costs and the state and local interests paying 30 percent. The Corps
was responsible for project design and construction and local interests
were responsible for maintenance of levees and flood controls. The
original project design, known as the barrier plan, included a series
of levees along the lakefront, concrete floodwalls along the Inner
Harbor Navigation Canal, and control structures, including barriers and
flood control gates located at the Rigolets and Chef Menteur Pass
areas. These structures were intended to prevent storm surges from
entering Lake Pontchartrain and overflowing the levees along the
lakefront. The original lakefront levees were planned to be from 9.3
feet to 13.5 feet high depending on the topography of the area directly
in front of the levees.
This project plan was selected over another alternative, known as the
high-level plan, which excluded the barriers and flood control gates at
the Rigolets and Chef Menteur Pass complexes and instead employed
higher levees ranging from 16 feet to 18.5 feet high along the
lakefront to prevent storm surges from inundating the protected areas.
In the 1960s, the barrier plan was favored because it was believed to
be less expensive and quicker to construct. As explained later in my
statement, this decision was reversed in the mid-1980s. The cost
estimate for the original project was $85 million (in 1961 dollars) and
the estimated completion date was 1978.
Figure 1: Flood Protection Control Levees In and Around New Orleans,
LA.
[See PDF for image]
[End of figure]
The original project designs were developed to combat a hurricane that
might strike the coastal Louisiana region once in 200-300 years. The
basis for this was the standard project hurricane developed by the
Corps with the assistance of the United States Weather Bureau (now the
National Weather Service). The model was intended to represent the most
severe meteorological conditions considered reasonably characteristic
for that region. The model projected a storm roughly equivalent to a
fast-moving Category 3 hurricane. A Category 3 hurricane has winds of
111-130 miles per hour and can be expected to cause some structural
damage from winds and flooding near the coast from the storm surge and
inland from rains.
Even before construction began on the project, it became evident that
some changes to the project plan were needed. Based on updated Weather
Bureau data on the severity of hurricanes, the Corps determined that
the levees along the three main drainage canals, that drain water from
New Orleans into Lake Pontchartrain, would need to be raised to protect
against storm surges from the lake. The need for this additional work
became apparent when Hurricane Betsy flooded portions of the city in
September 1965.
During the first 17 years of construction on the barrier plan, the
Corps continued to face project delays and cost increases due to design
changes caused by technical issues, environmental concerns, legal
challenges, and local opposition to various aspects of the project. For
example, foundation problems were encountered during construction of
levees and floodwalls which increased construction time; delays were
also encountered in obtaining rights-of-ways from local interests who
did not agree with all portions of the plan. By 1981, cost estimates
had grown to $757 million for the barrier plan, not including the cost
of any needed work along the drainage canals, and project completion
had slipped to 2008. At that time, about $171 million had been made
available to the project and the project was considered about 50
percent complete, mostly for the lakefront levees which were at least
partially constructed in all areas and capable of providing some flood
protection although from a smaller hurricane than that envisioned in
the plan.
More importantly during the 1970s, some features of the barrier plan
were facing significant opposition from environmentalists and local
groups who were concerned about environmental damages to the lake as
well as inadequate protection from some aspects of the project. The
threat of litigation by environmentalists delayed the project and local
opposition to building the control complexes at Rigolets and Chef
Menteur had the potential to seriously reduce the overall protection
provided by the project. This opposition culminated in a December 1977
court decision[Footnote 3] that enjoined the Corps from constructing
the barrier complexes, and certain other parts of the project until a
revised environmental impact statement was prepared and accepted. After
the court order, the Corps decided to change course and completed a
project reevaluation report and prepared a draft revised Environmental
Impact Statement in the mid-1980s that recommended abandoning the
barrier plan and shifting to the high-level plan originally considered
in the early 1960s. Local sponsors executed new agreements to assure
their share of the non-federal contribution to the revised project. The
level of protection provided to New Orleans was not expected to change
because the high-level design was expected to provide the same level of
protection as the original barrier design.
As of 2005, the project as constructed or being constructed included
about 125 miles of levees and the following major features:
* New levee north of Highway U.S. 61 from the Bonnet Carré Spillway
East Guide Levee to the Jefferson-St. Charles Parish boundary:
* Floodwall along the Jefferson-St. Charles Parish boundary:
* Enlarged levee along the Jefferson Parish lakefront:
* Enlarged levee along the Orleans Parish lakefront:
* Levees, floodwalls, and flood proofed bridges along the 17th Street,
Orleans Avenue and London Avenue drainage canals:
* Levees from the New Orleans lakefront to the Gulf Intracoastal
Waterway:
* Enlarged levees along the Gulf Intracoastal Waterway and the
Mississippi River-Gulf Outlet:
* New levee around the Chalmette area.
The project also includes a mitigation dike on the west shore of Lake
Pontchartrain.
The pre-Katrina estimated cost of construction for the completed
project was $738 million with the federal share being $528 million and
the local share $210 million. The estimated completion date as of May
2005 for the whole project was 2015. Prior to Katrina, the project was
estimated to be from 60-90 percent complete in different areas. The
work in Orleans Parish was estimated to be 90 percent complete with
some work remaining for bridge replacement along the Orleans Avenue and
London Avenue drainage canals. The floodwalls along the canals, where
the recent breaches occurred, were complete. Jefferson Parish work was
estimated to be 70 percent complete with work continuing on flood
proofing the Hammond Highway bridge over 17th Street and two lakefront
levee enlargements. Estimated completion for that work was 2010. In the
Chalmette area work was estimated to be 90 percent complete with some
levee enlargement work and floodwall work remaining. In St. Charles
Parish work was 60 percent complete with some gaps still remaining in
the levees. Closure of these gaps had been scheduled to be completed by
September 2005.
Post Katrina, four investigation teams sponsored by the American
Society of Civil Engineers, the Corps, the state of Louisiana, and the
National Science Foundation, began gathering forensic data to determine
what caused the levee breaches in New Orleans. Preliminary reports from
these teams indicate that they found a number of different mechanisms
that caused failures in the levee system, including scour erosion
caused by overtopping, seepage, soil failure, and internal erosion
(also known as piping). On November 4, 2005, the Corps told us that it
was too soon to determine whether the change in project design had any
impact on the levee breaches that occurred in New Orleans, and the
agency is still in the process of assessing whether the change in the
project design had any impact on the breaches. However, the
investigations necessary to address this question are not planned to be
conducted by the Corps as part of its ongoing examination of the
performance of the existing project. Instead these investigations would
be included in future analyses of any modifications to the existing
hurricane protection system.
Recent Funding History for the Project:
Federal allocations for the project totaled $458 million as of the
enactment of the fiscal year 2005 federal appropriation. This
represents 87 percent of the Federal government's responsibility of
$528 million with about $70 million remaining to complete the project
in 2015. Over the last 10 fiscal years (1996-2005), federal
appropriations have totaled about $128.6 million and Corps
reprogramming actions resulted in another $13 million being made
available to the project. During that time, appropriations have
generally declined from about $15-20 million annually in the earlier
years to about $5-7 million in the last three fiscal years. While this
may not be unusual given the state of completion of the project, the
Corps' project fact sheet from May 2005 noted that the President's
Budget request for fiscal years 2005 and 2006 and the appropriated
amount for fiscal year 2005 were insufficient to fund new construction
contracts. Among the construction efforts that could not be funded
according to the Corps were the following:
* Levee enlargements in all four parishes:
* Pumping station flood protection in Orleans Parish:
* Floodgates and a floodwall in St. Charles Parish:
* Bridge replacement in Orleans Parish.
The Corps had also stated that it could spend $20 million in fiscal
year 2006 on the project if the funds were available. The Corps noted
that several levees had settled and needed to be raised to provide the
design-level of protection. For the last few years, the project
generally received the amount of funds appropriated to it and was not
adversely affected by any Corps reprogramming actions.
In recent years, questions have been raised about the ability of the
project to withstand larger hurricanes than it was designed for such as
a Category 4 or 5, or even a slow-moving Category 3 hurricane that
lingered over the area and produced higher levels of rainfall. Along
this line, the Corps completed in 2002 a reconnaissance or pre-
feasibility study on whether to strengthen hurricane protection along
the Louisiana coast. A full feasibility study was estimated to take at
least five years to complete and cost about $8 million. In March 2005,
the Corps reported that it was allocating $79,000 to complete a
management plan for the feasibility study and a cost-share agreement
with local sponsors. The President's fiscal year 2006 budget request
did not include any funds for the feasibility project.
In closing, the Lake Pontchartrain hurricane project has been under
construction for nearly 40 years, much longer than originally
envisioned and at much greater cost, although much of that can be
attributed to inflation over these years, and the project is still not
complete. Whether the state of completion of the project or the change
in design played a role in the flooding of New Orleans in the wake of
Hurricane Katrina in August 2005 is still to be determined as are
issues related to whether a project designed to protect against
Category 4 or 5 hurricanes would or could have prevented this
catastrophe.
Mr. Chairman, this concludes my prepared testimony. We would be happy
to respond to any questions that you or Members of the Subcommittee may
have.
GAO Contact and Staff Acknowledgements:
For further information on this testimony, please contact Anu Mittal at
(202) 512-3841 or mittala@gao.gov. Individuals making contributions to
this testimony included Ed Zadjura, Ken Lightner, Omari Norman.
FOOTNOTES
[1] GAO, Cost, Schedule, And Performance Problems Of The Lake
Pontchartrain And Vicinity, Louisiana, Hurricane Protection Project,
GAO/PSAD-76-161 (Washington, D.C. Aug. 31, 1976); GAO, Improved
Planning Needed By The Corps Of Engineers To Resolve Environmental,
Technical, And Financial Issues On The Lake Pontchartrain Hurricane
Protection Project, GAO/MASAD-82-39 (Washington, D.C. Aug. 17, 1982);
and GAO, Army Corps of Engineers: Lake Pontchartrain and Vicinity
Hurricane Protection Project, GAO-05-1050T (Washington, D.C. Sept. 28,
2005).
[2] Pub. L. No. 89-298, § 204, 79 Stat. 1073, 1077.
[3] Save Our Wetlands v. Rush, Civ. A. No. 75-3710 (E.D. La. Dec. 30,
1977).
