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Healthy Rivers study finds beavers widely but unevenly distributed across upper Roaring Fork; county partners eye restoration projects in Thompson and Fourmile
Summary
A two‑year Pitkin County‑funded inventory found beaver occupancy at random sample points across the forest; staff identified Thompson and Fourmile creeks as priority sites for beaver‑assisted restoration, and said the National Forest Foundation may fund scaled interventions.
A county‑funded Healthy Rivers inventory presented to commissioners found beavers widely distributed across the Upper Roaring Fork watershed but noted uneven occupancy and historical loss of ponded, beaver‑influenced habitat in some valleys.
Clay Ramey, fisheries biologist for the Aspen‑Sopris Ranger District, reported the two‑year survey used random sampling across roughly 350,000 acres of national forest riparian areas. Field crews visited nearly 300 sites in 2024 and 2025; about 17% of randomly sampled points were occupied by beavers at the time of survey and roughly one‑third of sites showed evidence ("beaver sign") of past beaver activity.
Vegetation analysis at surveyed points showed occupied sites had more willow, aspen and alder, and were generally flatter and at lower elevations compared with unoccupied sites. Ramey also reported a statistically measurable difference between U.S. Forest grazing allotments and non‑grazed areas: grazing allotments tended to show less willow cover. He cautioned that grazing and vegetation patterns are correlated with terrain and land use and that the analysis does not automatically imply a causal effect of grazing policy on beaver presence.
Ramey and county staff said two watersheds — Middle Thompson Creek and Fourmile Creek — stood out as locations where historic beaver ponding had been reduced and where beaver dam analogs and other stream‑restoration techniques could help raise water storage, slow flows and promote riparian regrowth. The National Forest Foundation has expressed interest in a regional restoration product that would fund similar stream‑scale projects on the forest.
Commissioners welcomed the findings and asked staff to pursue pilot restoration work and funding coordination with the Forest Service and National Forest Foundation. Ramey said further work could rely on lidar and other spatial analyses to scale project selection and fast‑track demonstration projects.
