High severity wildfires in California’s Sierra Nevada pose a serious threat to people and nature. The 2013 Rim Fire in the Central Sierra Nevada burned nearly 257,000 acres, much of it at high severity, at a cost of more than $127 million, not including the costs to the economy and tourism. Although proactive forest management can reduce the risk of high-severity wildfire, the pace and scale of fuels treatments is insufficient, given the growing scope of the problem.
Wildfires, and the associated costs, are increasing in the western United States, but few studies have taken a hard look at the costs and benefits of fuel treatments. Using the Upper Mokelumne River Watershed as a representative case, the Sierra Nevada Conservancy, The Nature Conservancy, the U.S. Forest Service, and a diverse set of other stakeholders sought to answer the following question: Does it make economic sense to increase investment in proactive forest management to reduce the risk of large, damaging wildfires?
Mokelumne Watershed Avoided Cost Analysis – now available.
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The Mokelumne Watershed (in purple) was the focus of this study, and connects to East Bay water users (in blue) via a water pipeline.
Using state-of-the-art models for fire, vegetation and post-fire erosion, we analyzed the potential impacts of a landscape-scale fuel treatments program in the upper Mokelumne watershed. In addition, we examined who would benefit the most from investing in fuel treatments and reducing the risk of high-intensity wildfires. Our findings can help inform forest management not only in the Mokelumne watershed, but also in similar watersheds throughout the Sierra Nevada and the western United States.
These maps from the study indicate the change in wildfire intensity when fuel treatments are applied:
Contents of the report:
- Process of the Analysis and Scenario Development
- Model Results – Fuel Treatments Effects on Fire Behavior, Erosion, and Debris Flows
- Fire Suppression Costs
- Postfire Infrastructure Damages and Values
- Electricity and Water Utilities in the Mokelumne Watershed
- Treatment Costs and Impacts – Timber and Biomass
- Carbon Analysis
- Climate Change Vulnerability Assessment
A – Fire Modeling
B – Insects, Diseases, and Abiotic Factors
C – GeoWEPP Modeling – Hillslope Erosion
D – Debris Flow Modeling
E – FERGI – Estimated Postfire Gullly Erosion in the Mokelumne Watershed
F – Bathymetric Survey – Methods for Calculating the Volume of Tiger Creek Afterbay
G – North Fork Mokelumne River Sediment Budget Analysis
H – Bibliography on Wildfire, Fuels Reduction Treatment, and Prescribed Fire Effects on Runoff and Erosion
I – Bibliography on Hydrologic Effects of Meadow Restoration in the Sierra Nevada
J – Preliminary Assumptions
Please Note: These are large PDF files that may take a while to load. For best performance, right-click and choose “Save Target as”. The PDF file will download to your computer and then you can open the local copy of the PDF document. View and print this document with Adobe Acrobat Reader (Acrobat Reader 7.0 or higher is recommended) Download Adobe Acrobat Reader.
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