Twin Buttes Reservoir
Tom Green County, Texas23,508 acresView mapDirections
Not enough samples to grade — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). No letter yet. Here is what we do have.
- Public access
- Limited data
Twin Buttes Reservoir in Tom Green County, Texas is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 1.2 ft visibility. Phosphorus: 35 µg/L. Chlorophyll-a (algae): 32.6 µg/L. Surface area: 23508 acres.
- Clarity
- 1.2 ft
- Area
- 23,508 acres
- Phosphorus
- 35 µg/L
- Chlorophyll-a
- 32.6 µg/L
- Trend
- → Stable
- Public access
- Yes
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Watch Twin Buttes Reservoir’s letter
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Why Twin Buttes Reservoir has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Twin Buttes Reservoir, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded water clarity, phosphorus and algae (chlorophyll-a).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by TCEQ and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
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. Grade methodology: LakeQuality methodology.
What Twin Buttes Reservoir is good for
From access and monitoring records, not editorial picks.
- Boat launch2 documented ramps
- Big water23,508 acres
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Twin Buttes Reservoir
These readings exist but are not enough for an A–F grade — see why.
Very murky, less than 1.2 ft of visibility. Phosphorus 35 µg/L. Chlorophyll-a 32.6 µg/L. TSI 65.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.2 ft | Not graded |
| Phosphorus | 35 µg/L | Not graded |
| Chlorophyll-a (Algae) | 32.6 µg/L | Not graded |
| Trophic State Index (TSI) | 65 | Eutrophic |
High nutrients, frequent algae, reduced clarity
→ Twin Buttes Reservoir water level: the live USGS gauge reading
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 23,508 acres |
| Public Access | Yes |
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
Fishing Twin Buttes Reservoir
Water Quality Trend: → Stable
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.1 m/yr | 2 |
| Phosphorus | ↓ Declining | +10 µg/L/yr | 2 |
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
Graded lakes near Twin Buttes Reservoir
Twin Buttes Reservoir has no grade, but these lakes within a short drive do.
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. LakeQuality has not rated this lake (UNRATED) — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
What is the water quality grade for Twin Buttes Reservoir?
- Twin Buttes Reservoir in Tom Green County, Texas is not rated for water quality — its monitoring record does not meet the evidence bar. 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?
- The letter is 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.
Explore Twin Buttes Reservoir across LakeQuality
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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)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Named boat-access points from the USGS National Boat Ramps inventory