LA HIGHWAY 1 Values and Vulnerabilities. 2011 Update illustrating the Frequency of Inundation over Louisiana Highway 1 between Golden Meadow and Leeville,

LA HIGHWAY 1LA HIGHWAY 1

Values and Vulnerabilities

2011 Update illustrating the Frequency of Inundation over

Louisiana Highway 1between Golden Meadow and

Leeville, LA

Illustrations calculated by NOAAHighway Elevations data by Dr. Roy Dokka

LA 1 is relied upon for State-of-the-art infrastructure efficiently servicing the GOM

Existing Deepwater Structures in GOM:90% are serviced by Port Fourchon!

LA 1 Toll Road Update January 2010

LA 1 is relied upon to service thousands of miles of GOM Pipelines

LOOP – America’s only Deepwater Oil Port capable of handling VLCC’s

LA 1 is the National Poster Child of Critical At-Risk Energy Infrastructure

3 Week Loss of Services of Port Fourchon National Economic Impacts:

• $9.9 Billion in Sales Loss *

• $2.9 Billion in Household Earnings Loss

• $77,440 Jobs Loss Nationally

* Based on $66/barrel Oil

Source: The economic impacts of Port Fourchon on the National and Houma MSA Economies.PREPARED BY: LOREN C SCOTT & ASSOCIATES, February 2008.

Bench Mark “8762084 B 1986” 1.24m

Leeville Station Datum 0.00m

Mean Higher High Water (MHHW) 1.21m

Local Mean Sea Level (MSL) 1.08m

Mean Lower Low Water (MLLW) 0.94m

Tidal Datum Elevations based on 1983-2001 Modified National Tidal Datum Epoch (2002-2006 MSL)

Leeville, LA NOAA Tide Station Bench Mark Elevation Relationship to Tidal and Geodetic Datums using data from 1987-1990

Elevation difference 0.78m

Highest observed water level 3/23/1987 1.53m

NAVD88 (1993) no longer published; LA-1 Average NAVD88 Elevation from Mallory (2011)(Note: There is a high degree of uncertainty in NAVD88 elevations due to ongoing subsidence)

1.56m“5%” Elevation of LA-1 (Golden Meadow to Leeville)

Elevation difference 0.03m

NOAA 2/2011

Estimated NAVD88 (1993) 0.78m

Estimated Effects of RSLR on Frequency and Duration of Inundation for Leeville, LA using observations 1987-1990 and then projecting this 4-year time period forward using

present rate of sea level rise

Using “5%” LA-1 elevation of 0.78m NAVD88 (1993)

Occurrences of Inundation

(over 4-years)Duration of Inundation

(over 4- years)Elevation Rise

Above 1990 MSL

4-yr Time PeriodRSLR rate mm/yr) (# of tides)

(hours (percent of total time)) (meters)

1987- 1990 9.24 0 0 (0%) -2027-2030 9.24 124 960(6%) 0.32047- 2050 9.24 1127 19163(55%) 0.62097- 2100 9.24 1334 33699(96%) 1.0

The elevation of LA-1 will become increasingly inundated even if the present day relative

sea level rise (RSLR) remains constant in the future.

Note: NAVD88 elevations for bench marks and for LIDAR elevations for road surface are only estimates and have significant uncertainty

“5%” Elevation of LA-1 Leeville to Golden Meadow

“5%” Elevation of LA-1 Leeville to Golden Meadow

“5%” Elevation of LA-1 Leeville to Golden Meadow

LA 1 Toll Road Update January 2010

Questions for Tim Osborn

NOAA Regional Manger

Eastern Gulf