Somerville Lake Big Creek Arm
Burleson County, TexasView mapDirections
Nutrients and algae run well above the regional average.
↓ down from D at the last regrade
- Hypereutrophic
- #1 of 2 in the county
- Public access
- Limited data
Somerville Lake Big Creek Arm in Burleson County, Texas has a water quality grade of F (Algae-prone). Water clarity: 1.8 ft visibility. Phosphorus: 85 µg/L. Chlorophyll-a (algae): 67.7 µg/L.
- Clarity
- 1.8 ft
- Type
- Hypereutrophic
- Phosphorus
- 85 µg/L
- Chlorophyll-a
- 67.7 µg/L
- Trend
- ↑ Improving
- Public access
- Yes
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Somerville Lake Big Creek Arm is a highly nutrient-loaded hypereutrophic lake in Burleson County, Texas. Water quality is graded F based on 2 sampling years through 2025. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available with 2 public boat landings. Compared to the 1 other monitored lakes in Burleson County, Somerville Lake Big Creek Arm ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, TCEQ, last sampled 2025-11-18. Grade methodology: LakeQuality methodology.
What Somerville Lake Big Creek Arm is good for
From access and monitoring records, not editorial picks.
- Boat launch2 documented ramps
Swimming Safety
Grade onlyLimited data
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
The F is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: F (Algae-prone)
Very murky, less than 1.8 ft of visibility. Phosphorus 85 µg/L. Chlorophyll-a 67.7 µg/L. TSI 70. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.8 ft | Not graded |
| Phosphorus | 85 µg/L | Poor |
| Chlorophyll-a (Algae) | 67.7 µg/L | Poor |
| Trophic State Index (TSI) | 70 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
→ Somerville Lake Big Creek Arm water level: the live USGS gauge reading
Recreation & Access
- Birch Creek Recreation WaterPublic
- Welch ParkSemi-private
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Somerville Lake Big Creek Arm
Water Quality Trend: ↑ Improving
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.039 m/yr | 5 |
| Phosphorus | ↑ Improving | -4 µg/L/yr | 4 |
| Chlorophyll-a | ↑ Improving | -10.63 µg/L/yr | 4 |
County Ranking
Ranked #1 of 2 lakes in Burleson County
Nearby Lakes in Burleson County
Frequently asked questions about Somerville Lake Big Creek Arm
Where is Somerville Lake Big Creek Arm?
- Somerville Lake Big Creek Arm is a lake in Burleson County, Texas. LakeQuality grades it F for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Somerville Lake Big Creek Arm?
- Somerville Lake Big Creek Arm in Burleson County, Texas has a water quality grade of F (Algae-prone). Water clarity: 1.8 ft visibility. Phosphorus: 85 µg/L. Chlorophyll-a (algae): 67.7 µg/L.
Is Somerville Lake Big Creek Arm safe to swim in?
- The F is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Are there boat ramps on Somerville Lake Big Creek Arm?
- Somerville Lake Big Creek Arm has 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Birch Creek Recreation Water, Welch Park. Public access is listed as yes.
Explore Somerville Lake Big Creek Arm across LakeQuality
More Texas Lake Rankings
Other Grade F Lakes in Texas
Hypereutrophic Lakes in Texas
Where this data comes from
53 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Texas Commission on Environmental Quality
TCEQMAIN53 samples · 2020–2025
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