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Grand Mesa, Uncompahgre and Gunnison National Forest Watershed Vulnerability Assessment, Rocky Mountain Region (R2) 3. Stream miles inundated by reservoirs, expressed as a percentage of perennial and intermittent stream network in a watershed inundated by reservoirs greater than 50 acres in size, because at that scale entire stream reaches or major wetland complexes would be impacted. Route Related 1. Motorized route (roads and trails) density, expressed as miles of route per sq mi. of watershed. (Note: Travel management decisions made since 2005 are not reflected in these results.) 2. Motorized route density within buffered riparian area, expressed as miles of routes within the area of riparian habitat and a 100-foot buffer around riparian habitat by watershed. 3. Motorized route crossing density, expressed as number of crossing (determined by intersecting roads and trails layers with stream layer) compared to the total stream network (perennial and intermittent streams). Past vegetative treatments, expressed as a percentage of the watershed treated by some vegetation management within the past 50 years. High frequency of streamside recreational use, expressed as a percentage of the total miles of stream network in a watershed that have high levels of recreational use (camping, fishing, roads and trails, developed sites). Private land inholdings, expressed as a percentage of the total watershed area, was used as a measure of urban influences based on the assumption that as the amount of inholdings increases there is a greater potential for developments activities to be located on those private lands as opposed to surrounding NFS lands. Abandoned mine land site density, expressed as number of adits and tailings piles by area of each watershed. Values for each of the individual factors listed above were calculated and standardized for each factor (as described above for the values). The overall activity stressors ranking was determined by adding the individual factor standardized ratings together for each subwatershed. The resulting Activity Stressors Rankings were classified into quartiles. The top 25% were classified 3 (high), middle 50% were classified 2 (moderate), and lowest 25% were classified 1 (low). Figure 23 shows the resulting Activity Stressors Ranking. 96 Assessing the Vulnerability of Watersheds to Climate Change
Grand Mesa, Uncompahgre and Gunnison National Forest Watershed Vulnerability Assessment, Rocky Mountain Region (R2) Figure 23. Activity Stressors Ranking Method Used to Characterize Watershed Risk Due to Sensitivities and Stressors Watershed risk was evaluated in two ways, based on the two different sensitivities discussed above. Each sensitivity was combined with the activity stressors: 1) Erosion or Sediment Production Sensitivity combined with Activity Stressors, and 2) Runoff Response Sensitivity combined with Activity Stressors, with the resulting Watershed Risk rankings being determined using the following matrix. 97 Assessing the Vulnerability of Watersheds to Climate Change
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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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Coconino National Forest Watershed
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Sawtooth National Forest Watershed
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Shasta Trinity National Forest Wate
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Umatilla National Forest Watershed
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Ouachita National Forest Watershed
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Chequamegon-‐Nicolet National F
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Chugach National Forest Watershed V
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