TWDB Existing Reservoirs

Date(s): Coverage Availability/Geographic Extent: Footprint: Source(s):
2012 Statewide State TWDB

Data Access

Direct Download

The full TWDB Existing Reservoirs data set can be downloaded directly.

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Data Details

Available Formats: Shapefile
Alternative Data: NHD
Known Issues: Just polygons, minimal attributes
Recommended Uses: Planning, analysis, cartography


Major reservoir being defined as an impoundment that currently has at least 5,000 acre-feet of storage capacity at its normal operating level. Texas has 188 major water-supply reservoirs, and over 20 additional major reservoirs that serve no water-supply function. The major reservoirs of the state vary in size from 5,200 acre-feet conservation storage capacity for the Upper Nueces Lake to 4,472,900 acre-feet for the Toledo Bend Reservoir, which includes both the Louisiana and Texas portions of the reservoir (Appendix 6.1). Making the best use of existing reservoirs, controlling watershed erosion to maintain their holding capacity, and identifying viable sites for new reservoirs are key to effective long-term water supply management and planning in Texas.