USDA Forest Service

Chemistry of Lakes, Streams, and Bulk Deposition on and near the National Forests

USDA Forest Service Air Resource Management
Natural Resources Research Center
2150 Centre Ave., Bldg. A
Fort Collins, CO 80526
(970) 295-6012

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Welcome to the Air Resource Management Surface Water and Bulk Deposition Data Website


The USDA Forest Service is responsible for protecting watersheds on the national forests from the adverse effects caused by atmospheric deposition.  Thus, the Forest Service Air Program has been actively inventorying and monitoring hundreds of lakes and streams since the early 1980’s.  Our purposes have been to characterize:
1) Watersheds (lakes and streams) that are sensitive to the effects of acidic deposition and/or base cation depletion.
2) Long term trends in surface lake chemistry.

We refresh the database on or about the first of every month.  


We use these and other data to help us determine whether changes in lake and stream chemistry are due to changes in air quality, certain sources of air pollution, changes in weather, climate or land use, or other factors.  This information will be used to make informed decisions related to land management planning, air pollution source permitting, and statewide air quality strategies.


Much of the data at this website are provisional; that is, first order quality assurance has yet to be performed by the Forest Service. Additionally, the earliest of these data were collected with varing field protocols and so they deserve additional scrutiny. Recent data (in the last five years) were collected using consistent field protocols. We have good confidence that the laboratory physical and chemical analyses are generally of high quality. Although, we are active in evaluating and improving the quality of these data, we urge caution when drawing conclusions from them. Contact us for more details.

Source of Data 

Today much of the water data available at this website are analyzed in the US Forest Service Air Resource Management Laboratory in Fort Collins, CO. Should you want samples that were collected on or are representative of locations on the national forests to be analyzed by this laboratory, please contact us for details.

Database Analyst

Questions about the data or findings about quality or content should be directed to:
Barb Gauthier
Office: (970) 295-6012
Fax: (970) 295-5988

Additional Contacts

Ann Mebane
National Air Program
Office: (307) 578-8241

Last modified: Monday, 16-Dec-2013 14:19:27 CST
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