USGS OFR 2009-1150: Surficial Geology of the Floor of Lake Mead (Arizona and Nevada) as Defined by Sidescan-Sonar Imagery, Lake-Floor Topography, and Post-Impoundment Sediment Thickness, Figure 14

U.S. Geological Survey Open-File Report 2009-1150

Surficial Geology of the Floor of Lake Mead (Arizona and Nevada) as Defined by Sidescan-Sonar Imagery, Lake-Floor Topography, and Post-Impoundment Sediment Thickness

Title Page / List of Figures and Tables / Conversion Factors / Abstract / Introduction / Methods / Lake-Floor Geology / Discussion / Data Catalog / Acknowledgments / References Cited

Figure 14, graph of monthly lake-level elevations, and link to larger image.

Figure 14. Monthly lake-level elevations between February 1935, when the lake started filling, and May 2009 (U.S. Bureau of Reclamation, 2009). The major drop in lake level in the mid-1950s was due to a drought, and the second major drop in the mid-1960s coincides with the filling of Lake Powell. Note that seasonal variations in lake level prior to filling Lake Powell are 10-15 m, while they are much less since then.

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