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Plan, LRMP

  A. Background

  1. Most of the study area, approximately 500 square miles, is federally owned land.

  2. The predominance of federal land is shown in the map below [1].

  3. The San Juan National Forest Office (SJNF) of the U.S. Forest Service (USFS) manages the land.

  4. A Land and Resource Management Plan (LRMP) is applied by SJNF, as required by USFS [2].

    Plan | Range 


  B. Current status​

  1. In the LRMP, lineage greenback cutthroat trout are identified as present in the management area.

  2. It is a federally listed, threatened species.

  3. It has documented habitat in Little Taylor, Rio Lado, Roaring Forks, and Stoner [2].

  4. The LRMP notes that the Colorado River cutthroat trout present is a Forest Service sensitive species.

  5. It is found in "headwaters streams...tributary to the San Juan River system," including the study area [2].

  6. The LRMP notes also the "decline of the Colorado River cutthroat trout has been so severe..." [2].

  7. That it "was petitioned for federal listing" by the U.S. Fish and Wildlife Service [2].

  C. Looking forward​

  1. Listing was not approved, however, partially because of ongoing restoration activities [2].

  2. Still, it "may be especially vulnerable to increasing stream temperatures and hydrologic changes" [2, 3].

  3. The LRMP identifies cutthroat, brook, brown, and rainbow trout as Management Indicator Species (MIS).

  4. Such identification is part of the Forest Service's integrated planning process [2].

  5. The LRMP cites concern for loss of flow that can diminish food supply and "ultimately, aquatic habitat" [2].

  6. The LRMP expresses concern for sediment loading that can develop from grazing and other activities.

  7. It can reduce intergravel dissolved oxygen and increase stream temperatures, damaging fish habitat [2, 4].

  8. The LRMP indicates that inventories show decreasing brook, brown, cutthroat, and rainbow populations [2].

  9. It notes with continuing drought conditions, "fishery habitat is predicted to decrease into the future" [2].

  10. Rainbow and cutthroat trout populations may be kept stable by "artificial stocking" [2].

  11. Meanwhile, harvest would continue for all four species "in accordance with state fishing regulations" [2].



  2. "Final San Juan National Forest and Proposed Tres Rios Field Office Land and Resource Management Plan," U.S. Department of Agriculture, U.S. Forest Service, Region 2, San Juan National Forest, September 2013.

  3. Nydick, K., J. Crawford, M. Bidwell, C. Livensperger, I. Rangwala, and K. Cozzetto. 2012. Climate Change Assessment for the San Juan Mountain Regions, Southwestern Colorado, USA: A Review of Scientific Research. Mountain Studies Institute Report 2010-04. Silverton, Colorado: Mountain Studies Institute.

  4. Meehan, W.R. (ed.) 1991. Influences of Forest and Rangeland Management on Salmonid Fishes and their Habitats. Special Publication 19. Bethesda, Maryland: American Fisheries Society.

    Plan | Range 

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