addressing climate change adaptation in regional transportation plans

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Cal-Adapt ProjectionsTable 1. Summary of Cal-Adapt Climate Projections for the North Coast RegionEffectTemperatureChange,1990-2100PrecipitationSea Level RiseHeat WaveSnowpackRangesJanuary increase in average temperatures: 2°F by 2050 and up to 5°F by 2100July increase in average temperatures: 3°F by 2050 and up to 6°F by 2100(Modeled average temperatures; high emissions scenario)Annual precipitation varies by location with a subtle decrease throughout the century inmost areas. Areas of heavy rainfall (80 inches or more) are projected to lose 5 to 7 inchesby 2050 and 11 to 15 inches by the end of the century. Slightly drier places are projected tosee a decrease of around 3 to 4 inches by 2050 and 6 inches of precipitation by 2100.(CCSM3 climate model; high carbon emissions scenario)By 2100, sea levels may rise up to 55 inches, posing threats to many areas in the region,particularly in bays and estuaries. The increase in acreage vulnerable to 100-year floods dueto sea level rise in the region will be 18 percent in both Humboldt and Mendocino countiesand 17 percent in Del Norte County.Heat wave is defined as five consecutive days over 68°F over most of the coastal areas andas high as 93°F in some inland areas to the south. Little change is expected by 2050 withpossibly one to three more heat waves projected in region. By 2100, projected heat wavesare more variable. Along much of the coast eight to 15 more heat waves than currentlyoccur are projected. Inland it is variable, but generally lower, between two and eight morewaves per year.March snow levels in the eastern, higher-elevation portion of the region will drop to almostzero by the 2090s, a decrease of 2 to 10 inches from 2010 levels. In areas with more snow,3 to 5 inches of reduction will occur by 2050. In areas with currently little snow (
Biophysical CharacteristicsThe landscape of the North Coast region consists primarily of the CoastMountain Ranges, where peaks vary from 2,000 to 5,000 feet. The Klamath River,which originates in Oregon, winds its way through the north end of the state,culminating 45 miles south of Crescent City. The other major river system, theEel, extends from Lake County to the Pacific Ocean 15 miles south of Eureka(CERES, 2005). Most of this region, part of the larger Klamath/North CoastBioregion, is covered by forest. It receives more rainfall than any other part ofthe state (CDFG, 2007). The region supports diverse wildlife in varied ecosystemsthat include sand coastlines, coastal estuaries, grasslands, coastal shrub, freshwateraquatic ecosystems, riparian areas, pine forests, mixed evergreen forests, andredwood forests (CERES, 2005; CDFG, 2007). These ecosystems support humanactivities from basic services to industries such as forestry and fishing.Regional Entities• Air Districts: Lake, Mendocino, North Coast Unified• Regional Organizations: Del Norte Local Transportation Commission,Humboldt County Association of Governments, Lake County/City AreaPlanning Council, Mendocino Council of Governments• Tribal Lands (U.S. EPA, 2011): Big Lagoon, Big Valley, Blue Lake, CoyoteValley, Elk Valley, Hoopa Valley Indian, Hopland, Laytonville, Manchester(Point Arena), Middletown, Pinoleville, Redwood Valley, Resighini, Robinson,Rohnerville, Round Valley, Sherwood Valley, Smith River, Sulphur Bank (El Em),Table Bluff, Trinidad, Upper Lake, YurokPAGE 15APG: UNDERSTANDING REGIONAL CHARACTERISTICS
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Addressing Climate Change Adaptatio
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Page 157: appendix b reportState-of-the-Pract
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Page 190 and 191: Adaptation Planning Guide - Advisor
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Page 194 and 195: Climate Impact RegionsThe APG is or
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Page 246 and 247: Setting and HistoryThe California D
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Communities in this region should e
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Cal-Adapt ProjectionsTable 25. Summ
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Selected Infrastructure and Regiona
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have the resources to prepare for,
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Additional Resources• Sea Level R
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Timber practices have also had ecos
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Southeast Sierra RegionCounties: Al
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Biophysical CharacteristicsThe sout
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ultimately result in reduced water
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particular concern are populations
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Additional Resources• Sea Level R
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industry around Big Bear. As there
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California Natural Resources Agency
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addressing climate change adaptation in regional transportation plans

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