Twin Buttes Reservoir
Tom Green County, Texas23,508 acresView mapDirections
TCEQ publishes the water-quality measurements for Twin Buttes Reservoir. Here is what has been measured.
- Public access
- Limited data
Twin Buttes Reservoir in Tom Green County, Texas has water-quality measurements published by TCEQ, shown here as reported. Water clarity: 1.2 ft visibility. Phosphorus: 35 µg/L. Chlorophyll-a (algae): 32.6 µg/L. Surface area: 23508 acres.
Twin Buttes Reservoir is a 23,508-acre lake in Tom Green County, Texas. Water clarity is improving over recent sampling years. Limited fish-species data available. Public access is available with 2 public boat landings.
Source: EPA Water Quality Portal sampling records, TCEQ, last sampled 2021-09-20. Methodology: how these readings are compared.
What Twin Buttes Reservoir is good for
From access and monitoring records, not editorial picks.
- Boat launch2 documented ramps
- Big water23,508 acres
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Twin Buttes Reservoir is safe to swim in today is a call for the Texas Commission on Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Twin Buttes Reservoir
These are the measurements TCEQ publishes for Twin Buttes Reservoir, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Very murky, less than 1.2 ft of visibility. Phosphorus 35 µg/L. Chlorophyll-a 32.6 µg/L. TSI 65.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 1.2ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 35µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 32.6µg/L | Measured, not scored The green pigment in algae — a direct measure of how much algae is in the water. |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 65 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Twin Buttes Reservoir
Answers come straight from the public measurements and survey records on this page.
→ Twin Buttes Reservoir water level: the live USGS gauge reading
Lake Details
Surface area
23,508 acres
Public access
Yes
Listed by TCEQ
No bathymetric survey has been published for Twin Buttes Reservoir, so its depth is not documented here.
Recreation & Access
- Twin Buttes ReservoirPublic
- Twin Buttes ReservoirPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
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Stays near Twin Buttes Reservoir
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Fishing Twin Buttes Reservoir
Water quality readings over time
2 seasons of samples on record (2020–2021). Calling a direction takes at least 4 years of the same measurement.
Water clarity
Improving2 years
Phosphorus
Worsening+10 µg/L/yr2 years
Reservoir Info (USACE NID)
Twin Buttes Reservoir is a man-made reservoir impounded by the Twin Buttes Dam (completed 1963), built primarily for flood risk reduction on the Mid & So Concho Riv, Spring Cr; earth-type dam, 134 ft tall and 42,460 ft long.
- Surface area
- 23,508 ac
- Normal storage
- 186,210 ac-ft
- Max storage
- 1,088,152 ac-ft
- Drainage area
- 3,969 sq mi
- Hazard class
- High
- Owner
- BUREAU OF RECLAMATION
All listed purposes: Flood Risk Reduction;Irrigation;Recreation.
Source: USACE National Inventory of Dams, NID ID TX00022 · Operator website
Nearby Lakes in Tom Green County
Frequently asked questions about Twin Buttes Reservoir
Where is Twin Buttes Reservoir?
- Twin Buttes Reservoir is a lake in Tom Green County, Texas. Its water-quality measurements are published by TCEQ and shown on this page as reported.
What is the water quality of Twin Buttes Reservoir?
- Twin Buttes Reservoir in Tom Green County, Texas has water-quality measurements published by TCEQ, shown here as reported. Water clarity: 1.2 ft visibility. Phosphorus: 35 µg/L. Chlorophyll-a (algae): 32.6 µg/L. Surface area: 23508 acres.
Is Twin Buttes Reservoir safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Are there boat ramps on Twin Buttes Reservoir?
- Twin Buttes Reservoir has 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Twin Buttes Reservoir, Twin Buttes Reservoir. Public access is listed as yes.
Can I fish at Twin Buttes Reservoir?
- Twin Buttes Reservoir has 2 documented boat landings in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Texas's fish and wildlife agency, so check its current regulations before you go.
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Where this data comes from
7 measurements from 1 monitoring station, 2020–2021. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Texas Commission on Environmental Quality
TCEQMAIN7 samples · 2020–2021
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Named boat-access points from the USGS National Boat Ramps inventory