Low Flows and Hot Trout: Dealing with the Effects of Climate Change in the Clark Fork Watershed
March 30, 2011
- Jill Alban
Manager/Director/Executive
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Project Summary / Overview
The Clark Fork watershed extends from Butte, MT to Sandpoint, ID and drains nearly the entire western portion of Montana. Based on decades of data and observations, it is clear that the Clark Fork River basin is already experiencing changing climate conditions including droughts, increased wildfires, decreased snowpack, shrinking glaciers, and early runoff. In response, the Clark Fork Coalition wrote a report, Low Flows Hot Trout: Climate Change in the Clark Fork Watershed, examining likely climate change impacts in the watershed and offering strategies to adapt to these impacts that range from individual actions to larger-scale policy changes.
Project Background
The Clark Fork Coalition is a non-profit organization located in Missoula, Montana. The organization is dedicated to protecting and restoring the Clark Fork River basin, a 22,000-square-mile area that extends from Butte, MT to Sandpoint, ID. Founded in 1985, the Clark Fork Coalition dedicates a large share of its program work to watershed restoration, including planting and restoring riparian vegetation, fixing degraded and disconnected creeks and streams, restoring eroding streambanks, removing fish passage barriers, and working with landowners to keep water in streams. In late 2007 they began working on researching climate change impacts and adaptation strategies for the basin.
Climate change impacts in the Clark Fork basin include a 1-2˚C increase in average temperature, longer growing season, changes in seasonal patterns of temperature and precipitation, shrinking spring snowpack and earlier spring runoff, melting glaciers, and declining river flows. These impacts are predicted to lead to a myriad of effects including an increase in major wildfires and length of the fire season, a 5-30% decrease in trout habitat leading to decreased numbers of sensitive species such as bull trout, declining water-dependent bird populations, loss of whitebark pine, and shifts in geographic distributions and behaviors of organisms.

