Skip to main content
U.S. flag

An official website of the United States government

Bathymetric Survey and Storage Capacity of Upper Lake Mary near Flagstaff, Arizona

May 15, 2008

Upper Lake Mary is a preferred drinking-water source for the City of Flagstaff, Arizona. Therefore, storage capacity and sedimentation issues in Upper Lake Mary are of interest to the City. The U.S. Geological Survey, in cooperation with the City of Flagstaff, collected bathymetric and land-survey data in Upper Lake Mary during late August through October 2006. Water-depth data were collected using a single-beam, high-definition fathometer. Position data were collected using real-time differential global position system receivers. Data were processed using commercial software and imported into geographic information system software to produce contour maps of lakebed elevations and for the computation of area and storage-capacity information.

At full pool (spillway elevation of 6,828.5 feet above mean sea level), Upper Lake Mary has a storage capacity of 16,300 acre-feet, a surface area of 939 acres, a mean depth of 17.4 feet, and a depth near the dam of 39 feet. It is 5.6 miles long and varies in width from 308 feet near the central, narrow portion of the lake to 2,630 feet in the upper portion. Comparisons between this survey and a previous survey conducted in the 1950s indicate no apparent decrease in reservoir area or storage capacity between the two surveys.

Citation Information

Publication Year 2008
Title Bathymetric Survey and Storage Capacity of Upper Lake Mary near Flagstaff, Arizona
DOI 10.3133/ofr20081098
Authors Nancy J. Hornewer, Marilyn E. Flynn
Publication Type Report
Publication Subtype USGS Numbered Series
Series Title Open-File Report
Series Number 2008-1098
Index ID ofr20081098
Record Source USGS Publications Warehouse
USGS Organization Arizona Water Science Center