GRANGER LK NR GRANGER

RESERVOIR LEVELS USGS 08105600
April 21, 2025


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Granger Dam, also known as Granger Lake, is a Federal-owned water supply dam located in Laneport, Williamson County, Texas. Completed in 1979, this Earth dam serves multiple purposes including fish and wildlife pond, flood risk reduction, recreation, and of course, water supply for the region. With a height of 115 feet and a storage capacity of 650,000 acre-feet, the dam poses a high hazard potential due to its location on the San Gabriel River.

Despite the risks associated with the dam, USACE Fort Worth District has implemented various risk management measures to ensure the safety and stability of Granger Dam. Regular inspections, surveillance, and monitoring are conducted to detect potential concerns, especially during high water levels. Additionally, the district works closely with local emergency managers to develop and update evacuation plans, conduct emergency exercises, and communicate risks to stakeholders. Although the dam reduces flooding risk downstream, the possibility of a breach could have severe consequences for nearby rural communities and cities, emphasizing the importance of continued vigilance and proactive risk mitigation efforts.

Lake Or Reservoir Water Surface Elevation Above Ngvd 1929, Ft 24hr Change 0%
Percent of Normal 100%
Minimum 498.4 ft
2011-11-13
Maximum 519.23 ft
2015-05-31
Average 504 ft
Dam_Height 115
Hydraulic_Height 114
Drainage_Area 475
Year_Completed 1979
Nid_Storage 650000
Structural_Height 115
Primary_Dam_Type Earth
Foundations Rock, Soil
Surface_Area 4400
Hazard_Potential High
Outlet_Gates Uncontrolled - 0
River_Or_Stream SAN GABRIEL RIVER
Dam_Length 15240
Nid_Height 115
       
Seasonal Comparison
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Lake Or Reservoir Water Surface Elevation Above Ngvd 1929, Ft Levels

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