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Shasta Trinity National Forest Watershed Vulnerability Assessment, Pacific Southwest Region (R5) Figure 10. Distribution of salmonid and resident fishes on the Shasta-Trinity NF. Density of TES fish species are shown for HUC-4, HUC-5 and HUC-6. Sensitive Species There are 28 USFS sensitive species on the Forest; over 70% of these are aquatic species (Table 2). Most of these species are already at risk due to loss of habitat and habitat fragmentation. Additional stress to species is probable due to influences of warming on hydrologic processes. Periods of extended drought would also exacerbate the effects of drying on small aquatic habitats. Timing and volume of hydrographs are likely to shift. These increased stresses could result in loss of habitats and the species they support. The non-fish species are strongly associated with springs and other water bodies less than one acre in size (Figure 11). This analysis uses impacts to these habitats as the proxy for species effects. 194 Assessing the Vulnerability of Watersheds to Climate Change
Shasta Trinity National Forest Watershed Vulnerability Assessment, Pacific Southwest Region (R5) Hardhead redband trout Fishes Amphibians & Reptiles Terrestrial & Aquatic Invertebrates Southern torrent salamander Foothill yellow legged frog 195 Assessing the Vulnerability of Watersheds to Climate Change Shasta sideband snail Shasta hesperian snail Wintu sideband snail CA floater (freshwater mussel) Steelhead Cascade frog Shasta chaparral snail Nugget Pebble Snail Spring-run Chinook salmon Fall-run Chinook salmon Shasta salamander Tehama chaparral snail Scalloped Juga (snail) Northwestern pond turtle (reptile) Table 2. Shasta Trinity National Forest Sensitive species (List since 2007) Pressley hesperian snail Montane peaclam Figure 11. Distribution of springs and lentic habitats less than an acre in size on the Shasta-Trinity NF. Densities of habitats are shown for HUC-4, HUC-5 and HUC-6. Infrastructure Forest infrastructure located in or near water bodies includes road crossings (including bridges) and nearstream road segments, campgrounds, and water diversion facilities. As temperatures warm and more energy drives the hydrologic cycle, increases in the size of peak precipitation and flow events is anticipated. These increases will increase the risk of damage to near channel infrastructure from increased winter peak flows, including rain-on-snow events. Data used to characterize location and density of infrastructure included the distributions of stream crossings, water diversions, and areas that are susceptible to debris flows, mass wasting and flooding.
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AUTHORS AND CONTRIBUTORS Authors* M
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ASSESSSING THE VULNERABILITY OF WAT
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staff; the task group included repr
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Figure 2. Conceptual model for asse
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Figure 3. Density of springs and sm
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Using Historic Data One finding con
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NF (Region 8) relied on information
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level of uncertainty. Though there
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climate (Casola et al. 2005). Only
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sensitivity. Most were derived from
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The sensitivity evaluation typicall
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in exposure. The result of combinin
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highest priority for management act
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to information affected the assessm
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with and rely on in many resource d
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Pilot National Forest Reports Conte
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Assessment of Watershed Vulnerabili
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Gallatin National Forest Watershed
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Helena National Forest Watershed Vu
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Grand Mesa, Uncompahgre and Gunniso
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White River National Forest Watersh
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Coconino National Forest Watershed
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Chequamegon-‐Nicolet National F
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Chugach National Forest Watershed V
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