Big Creek Lake
Delta County, Texas513 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.
- 38 ft max depth
- Public access
- Limited data
Big Creek Lake in Delta County, Texas is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 1.5 ft visibility. Phosphorus: 111 µg/L. Chlorophyll-a (algae): 16.3 µg/L. Surface area: 512.8 acres.
- Clarity
- 1.5 ft
- Max depth
- ~38 ft est.
- Area
- 513 acres
- Phosphorus
- 111 µg/L
- Chlorophyll-a
- 16.3 µg/L
- Public access
- Yes
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Watch Big Creek Lake’s letter
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Why Big Creek Lake 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 Big Creek Lake, 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.
Big Creek Lake is a 513-acre lake in Delta County, Texas with an estimated average depth of about 38 feet. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, TCEQ, last sampled 2020-06-10. Grade methodology: LakeQuality methodology.
What Big Creek Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Big Creek Lake
These readings exist but are not enough for an A–F grade — see why.
Very murky, less than 1.5 ft of visibility. Phosphorus 111 µg/L. Chlorophyll-a 16.3 µg/L. TSI 67.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.5 ft | Not graded |
| Phosphorus | 111 µg/L | Not graded |
| Chlorophyll-a (Algae) | 16.3 µg/L | Not graded |
| Trophic State Index (TSI) | 67 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~38 ft est. |
| Average Depth | ~4 ft est. |
| Surface Area | 513 acres |
| Public Access | Yes |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Texas has not published bathymetry for Big Creek Lake.
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Recreation & Access
- Big Creek LakePublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Big Creek Lake
Reservoir Info (USACE NID)
Big Creek Lake is a man-made reservoir impounded by the Big Creek Dam (completed 1987), built primarily for water supply on the Big Creek; earth-type dam, 38 ft tall and 4,350 ft long.
- Surface area
- 512.8 ac
- Normal storage
- 4,625 ac-ft
- Max storage
- 13,296 ac-ft
- Drainage area
- 11.92 sq mi
- Hazard class
- High
- Owner
- CITY OF COOPER
Source: USACE National Inventory of Dams, NID ID TX06314 · Operator website
Graded lakes near Big Creek Lake
Big Creek Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Delta County
Frequently asked questions about Big Creek Lake
Where is Big Creek Lake?
- Big Creek Lake is a lake in Delta 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 Big Creek Lake?
- Big Creek Lake in Delta County, Texas is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 1.5 ft visibility. Phosphorus: 111 µg/L. Chlorophyll-a (algae): 16.3 µg/L. Surface area: 512.8 acres.
Is Big Creek Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
How deep is Big Creek Lake?
- No published bathymetric survey covers Big Creek Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 38 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate. The lake covers 512.8 acres.
Are there boat ramps on Big Creek Lake?
- Big Creek Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Big Creek Lake. Public access is listed as yes.
Explore Big Creek Lake across LakeQuality
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Where this data comes from
6 measurements from 1 monitoring station, 2020. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Texas Commission on Environmental Quality
TCEQMAIN6 samples · 2020
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
Lake size & watershed from HydroLAKES (HydroSHEDS)
Named boat-access points from the USGS National Boat Ramps inventory