Lees Ferry - 100 Years of Streamflow Monitoring

On October 1, 2021, the U.S. Geological Survey Colorado River streamflow gaging site (USGS 09380000) at Lees Ferry will mark its 100-year anniversary of recording continuous streamflow data. As the gage of record for the apportionment of the Colorado River between the Upper and Lower Colorado River basins, the Lees Ferry site is arguably one of the most important streamflow sites in the U.S.