Lake Tahoe is a beautiful Alpine Lake in the Sierra Nevada. Known for its deep, clear water, Lake Tahoe is the second deepest lake in the United States, with a maximum depth of 1,645 feet. The average depth of Lake Tahoe is 1,000 feet.
Images
Lake Tahoe is a beautiful Alpine Lake in the Sierra Nevada. Known for its deep, clear water, Lake Tahoe is the second deepest lake in the United States, with a maximum depth of 1,645 feet. The average depth of Lake Tahoe is 1,000 feet.

Wintertime at monitoring location USGS 10308200 East Fork Carson River below Markleeville Creek near Markleeville, CA

Early spring at monitoring location USGS 10308200 East Fork Carson River below Markleeville Creek near Markleeville, CA.
Early spring at monitoring location USGS 10308200 East Fork Carson River below Markleeville Creek near Markleeville, CA.

Graph showing population growth in Douglas County, NV between 1969 and 2020. Data sourced from Nevada Economic Analysis Project compiled by the Regional Income and Product Divisions of the Bureau of Economic Analysis, U.S. Department of Commerce (11-16-2021).
Graph showing population growth in Douglas County, NV between 1969 and 2020. Data sourced from Nevada Economic Analysis Project compiled by the Regional Income and Product Divisions of the Bureau of Economic Analysis, U.S. Department of Commerce (11-16-2021).
The graph shows historic pumping over time in Carson Valley, NV. Between the 1970s and early 2000’s, Carson Valley underwent rapid population growth and total pumping increased by an order of magnitude, from 3,360 acre-feet in 1970 to 31,100 in 2004.
The graph shows historic pumping over time in Carson Valley, NV. Between the 1970s and early 2000’s, Carson Valley underwent rapid population growth and total pumping increased by an order of magnitude, from 3,360 acre-feet in 1970 to 31,100 in 2004.

Photo of USGS hydrologist collecting a sediment sample at Trout Creek near Tahoe Valley, CA
Photo of USGS hydrologist collecting a sediment sample at Trout Creek near Tahoe Valley, CA

Photo of sample taken using DH-81 sampler at Trout Creek near Tahoe Valley, CA
Photo of sample taken using DH-81 sampler at Trout Creek near Tahoe Valley, CA
Ruby Lake National Wildlife Refuge lies at the southern end of Ruby Valley in northeast Nevada. For more information visit the Ruby Lake NWR website.
Ruby Lake National Wildlife Refuge lies at the southern end of Ruby Valley in northeast Nevada. For more information visit the Ruby Lake NWR website.

Water year 2021 streamflow summary for the Upper Truckee River at South Lake Tahoe, USGS Site 10336610.
linkWater year 2020 streamflow summary for the Upper Truckee River at South Lake Tahoe, USGS Site 10336610.
Water year 2021 streamflow summary for the Upper Truckee River at South Lake Tahoe, USGS Site 10336610.
linkWater year 2020 streamflow summary for the Upper Truckee River at South Lake Tahoe, USGS Site 10336610.
View of near shore Third Creek, NV
Did you know the USGS has been studying groundwater since we were founded? USGS first measured the groundwater level at the well in this photo in 1918, over one hundred years ago! How often water levels are measured at a site in the USGS groundwater monitoring networks varies, depending on the scientific purpose of the measurement.
Did you know the USGS has been studying groundwater since we were founded? USGS first measured the groundwater level at the well in this photo in 1918, over one hundred years ago! How often water levels are measured at a site in the USGS groundwater monitoring networks varies, depending on the scientific purpose of the measurement.
Did you know the USGS has been studying groundwater since we were founded? USGS first measured the groundwater level at the well in this photo in 1918, over one hundred years ago! How often water levels are measured at a site in the USGS groundwater monitoring networks varies, depending on the scientific purpose of the measurement.
Did you know the USGS has been studying groundwater since we were founded? USGS first measured the groundwater level at the well in this photo in 1918, over one hundred years ago! How often water levels are measured at a site in the USGS groundwater monitoring networks varies, depending on the scientific purpose of the measurement.
A USGS Hydrologic Technician collects eDNA samples alongside a stream in the Nevada wilderness
A USGS Hydrologic Technician collects eDNA samples alongside a stream in the Nevada wilderness

View looking downstream of Lahontan Reservoir. Monitoring location USGS 10312150 Carson River below Lahontan Reservoir near Fallon, NV measures streamflow releases from Lahontan Dam.
View looking downstream of Lahontan Reservoir. Monitoring location USGS 10312150 Carson River below Lahontan Reservoir near Fallon, NV measures streamflow releases from Lahontan Dam.
Wild horses in the Virginia City Highlands, Nev.
Wild horses in the Virginia City Highlands, Nev.
USGS technician measuring streamflow in northern Nevada.
USGS technician measuring streamflow in northern Nevada.
USGS Streamgaging Station in northern Nevada.
USGS Streamgaging Station in northern Nevada.

Well pumping as part of an aquifer test in Lovelock Valley, Nevada.
Well pumping as part of an aquifer test in Lovelock Valley, Nevada.
Flood water on Carson River near Nevada Water Science Center Office.
Flood water on Carson River near Nevada Water Science Center Office.

USGS staff gage (ruler) measuring the height of the water, on the Carson River, near Brunswick Canyon, Nevada.
USGS staff gage (ruler) measuring the height of the water, on the Carson River, near Brunswick Canyon, Nevada.
Streamgaging on Martin Creek, near Paradise Valley, Nevada.
Streamgaging on Martin Creek, near Paradise Valley, Nevada.