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Transportation and Climate Change Clearinghouse

Impact Forecasts

State of Maryland Statistics

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Increase in Eustatic SLR 6 cm 6.5 cm
Regular
Inundation
At-Risk Total Regular
Inundation
At-Risk Total
Length Km % Affected Km % Affected Km % Affected Km % Affected Km % Affected Km % Affected
Interstates 0.0 0% 1.5 0% 2 0% 0.0 0% 1.5 0% 2 0%
Non-Interstate Principal Arterials 2.5 0% 9.4 0% 12 0% 2.5 0% 9.4 0% 12 0%
Minor Arterials 0.7 0% 19.6 1% 20 1% 0.7 0% 20.2 1% 21 1%
National Highway System (NHS) 1.9 0% 8.3 0% 10 0% 2.0 0% 8.4 0% 10 0%
Rails 2.1 0% 12.9 0% 15 1% 2.2 0% 13.2 0% 15 1%
Area Acres % Affected Acres % Affected Acres % Affected Acres % Affected Acres % Affected Acres % Affected
Ports 157 17% 104 11% 261 28% 158 17% 104 11% 262 28%
Airport Property 12 0% 71 1% 82 1% 12 0% 71 1% 83 1%
Airport Runways 0 0% 0 0% 0 0% 0 0% 0 0% 0 0%
Total Land Area Affected 107,605 2% 168,203 3% 275,808 4% 108,691 2% 168,513 3% 277,203 4%


Increase in Eustatic SLR 13 cm 17.5 cm
Regular
Inundation
At-Risk Total Regular
Inundation
At-Risk Total
Length Km % Affected Km % Affected Km % Affected Km % Affected Km % Affected Km % Affected
Interstates 0.0 0% 1.6 0% 2 0% 0.0 0% 1.7 0% 2 0%
Non-Interstate Principal Arterials 2.7 0% 9.8 0% 13 0% 2.9 0% 9.9 0% 13 0%
Minor Arterials 0.9 0% 23.4 2% 24 2% 1.5 0% 25.1 2% 27 2%
National Highway System (NHS) 2.1 0% 8.8 0% 11 0% 2.2 0% 9.0 0% 11 0%
Rails 2.6 0% 13.7 1% 16 1% 3.0 0% 15.3 1% 18 1%
Area Acres % Affected Acres % Affected Acres % Affected Acres % Affected Acres % Affected Acres % Affected
Ports 161 17% 105 11% 266 28% 163 17% 105 11% 268 29%
Airport Property 15 0% 73 1% 87 1% 17 0% 74 1% 91 1%
Airport Runways 0 0% 0 0% 0 0% 0 0% 0 0% 0 0%
Total Land Area Affected 124,235 2% 181,364 3% 305,599 5% 135,046 2% 202,579 3% 337,625 5%


Increase in Eustatic SLR 21 cm 31 cm
Regular
Inundation
At-Risk Total Regular
Inundation
At-Risk Total
Length Km % Affected Km % Affected Km % Affected Km % Affected Km % Affected Km % Affected
Interstates 0.0 0% 1.8 0% 2 0% 0.1 0% 1.9 0% 2 0%
Non-Interstate Principal Arterials 3.1 0% 10.1 0% 13 0% 3.5 0% 11.0 0% 14 1%
Minor Arterials 1.9 0% 25.9 2% 28 2% 3.4 0% 28.8 2% 32 2%
National Highway System (NHS) 2.3 0% 9.2 0% 12 0% 2.6 0% 10.1 0% 13 1%
Rails 3.2 0% 18.5 1% 22 1% 3.6 0% 20.4 1% 24 1%
Area Acres % Affected Acres % Affected Acres % Affected Acres % Affected Acres % Affected Acres % Affected
Ports 165 18% 105 11% 271 29% 170 18% 107 11% 277 30%
Airport Property 19 0% 75 1% 94 1% 26 0% 76 1% 102 1%
Airport Runways 0 0% 0 0% 0 0% 0 0% 1 0% 1 0%
Total Land Area Affected 142,388 2% 209,087 3% 351,475 6% 159,439 3% 211,745 3% 371,184 6%


Increase in Eustatic SLR 30 cm 48.5 cm
Regular
Inundation
At-Risk Total Regular
Inundation
At-Risk Total
Length Km % Affected Km % Affected Km % Affected Km % Affected Km % Affected Km % Affected
Interstates 0.1 0% 1.9 0% 2 0% 0.1 0% 2.1 0% 2 0%
Non-Interstate Principal Arterials 3.4 0% 10.9 0% 14 1% 6.0 0% 10.8 0% 17 1%
Minor Arterials 3.3 0% 28.7 2% 32 2% 5.7 0% 36.6 2% 42 3%
National Highway System (NHS) 2.6 0% 10.0 0% 13 1% 4.9 0% 9.9 0% 15 1%
Rails 3.5 0% 20.3 1% 24 1% 4.8 0% 30.2 1% 35 1%
Area Acres % Affected Acres % Affected Acres % Affected Acres % Affected Acres % Affected Acres % Affected
Ports 170 18% 107 11% 276 29% 180 19% 110 12% 290 31%
Airport Property 25 0% 75 1% 101 1% 44 0% 84 1% 128 1%
Airport Runways 0 0% 1 0% 1 0% 0 0% 2 0% 2 0%
Total Land Area Affected 157,697 3% 211,930 3% 369,627 6% 203,766 3% 212,767 3% 416,533 7%


Increase in Eustatic SLR 59 cm
Regular
Inundation
At-Risk Total
Length Km % Affected Km % Affected Km % Affected
Interstates 0.1 0% 2.3 0% 2 0%
Non-Interstate Principal Arterials 6.5 0% 14.4 1% 21 1%
Minor Arterials 8.5 1% 57.3 4% 66 4%
National Highway System (NHS) 5.3 0% 13.4 1% 19 1%
Rails 5.5 0% 38.2 1% 44 2%
Area Acres % Affected Acres % Affected Acres % Affected
Ports 186 20% 111 12% 298 32%
Airport Property 65 1% 81 1% 147 1%
Airport Runways 0 0% 2 0% 3 0%
Total Land Area Affected 236,581 4% 237,971 4% 474,552 8%


1. Sources: Interstates, Non-Interstate Principal Arterials, Minor Arterials, and NHS - National Highway Planning Network (NHPN). Rails - Federal Railroad Administration.
Ports - Digitized from Digital Orthophoto Quadrangles clipped to the mean high water line. Airport Property and Runways - Tele Atlas.
2. The NHPN includes all Interstates and other Principal Arterials, all Rural Minor Arterials, and a small portion of the Urban Minor Arterials, as well as the NHS.
3. This study includes the Rural Minor Arterials but not the Urban Minor Arterials.
4. See section 3 of the "Study Goals and Methodologies" for an explanation of how these results were generated.
The results should not be understood as defining specific changes in water levels at precise points in time.
5. The Total column for each scenario includes the sum of Regular Inundation and At-Risk. The At-Risk column does not include Regularly Inundated data.

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