Upper San Marcos River WS SCS Site 4 is a vital flood risk reduction structure located in Hays, Texas, along the Purgatory Creek.
Wind
Humidity
Built in 1985 by the USDA NRCS, this earth dam stands at a height of 100 feet and spans 977 feet in length, providing a storage capacity of 8,421 acre-feet to mitigate potential flooding in the area. The dam is regulated by the Texas Commission on Environmental Quality (TCEQ) and undergoes regular inspections to ensure its structural integrity and operational effectiveness.
With a drainage area of 20.1 square miles and a maximum discharge capacity of 60,214 cubic feet per second, Upper San Marcos River WS SCS Site 4 plays a crucial role in managing water flow during periods of heavy rainfall and potential flooding events. The dam's spillway, with a width of 369 feet, helps to safely release excess water downstream. Despite its moderate risk assessment rating, the dam is reported to be in satisfactory condition as of the last assessment in 2018, highlighting its importance in protecting the surrounding community and environment from the impacts of flooding.
Managed by local government authorities in San Marcos, this flood risk reduction structure not only serves as a key component of water resource management but also contributes to climate resilience efforts in the region. Its strategic location and efficient design make Upper San Marcos River WS SCS Site 4 a crucial asset for safeguarding the area against potential flood hazards, showcasing the importance of infrastructure in addressing the challenges posed by changing weather patterns and extreme climate events.
Year Completed |
1985 |
Dam Length |
977 |
Dam Height |
100 |
River Or Stream |
PURGATORY CREEK |
Primary Dam Type |
Earth |
Surface Area |
21 |
Hydraulic Height |
100 |
Drainage Area |
20.1 |
Nid Storage |
8421 |
Structural Height |
100 |
Outlet Gates |
Slide (sluice gate) - 1, Uncontrolled - 2 |
Hazard Potential |
Not Available |
Foundations |
Unlisted/Unknown |
Nid Height |
100 |
San Marcos Rv At San Marcos
|
81cfs |
Blanco Rv At San Marcos
|
0cfs |
Blanco Rv At Wimberley
|
7cfs |
Guadalupe Rv At Sattler
|
61cfs |
Blanco Rv At Halifax Rch Nr Kyle
|
5cfs |
Blanco Rv Nr Kyle
|
0cfs |
| Location | Reservations | Toilets |
|---|---|---|
Leisure Resort on the San Marco River
|
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North Park - Canyon Lake
|
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Camp Huaco Springs
|
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Canyon Lake Military - Randolph AFB
|
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Canyon - Canyon Lake
|