Phelps Lake
Rockwall County, Texas45 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
Phelps Lake in Rockwall County, Texas is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 0.6 ft visibility. Phosphorus: 180 µg/L. Chlorophyll-a (algae): 22 µg/L. Surface area: 45 acres.
- Clarity
- 0.6 ft
- Area
- 45 acres
- Phosphorus
- 180 µg/L
- Chlorophyll-a
- 22 µg/L
- Public access
- Yes
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Watch Phelps Lake’s letter
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Why Phelps 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 Phelps 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.
Phelps Lake is a 45-acre lake in Rockwall County, Texas. Limited fish-species data available. Public access is available.
Source: EPA Water Quality Portal sampling records, TCEQ, last sampled 2020-08-20. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Phelps Lake
These readings exist but are not enough for an A–F grade — see why.
Very murky, less than 0.6 ft of visibility. Phosphorus 180 µg/L. Chlorophyll-a 22 µg/L. TSI 75.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 0.6 ft | Not graded |
| Phosphorus | 180 µg/L | Not graded |
| Chlorophyll-a (Algae) | 22 µg/L | Not graded |
| Trophic State Index (TSI) | 75 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 45 acres |
| Public Access | Yes |
No bathymetric survey has been published for Phelps Lake, so its depth is not documented here.
Fishing Phelps Lake
Reservoir Info (USACE NID)
Phelps Lake is a man-made reservoir impounded by the Upper East Fk Laterals WS SCS Site 4b Dam (completed 1955), built primarily for flood risk reduction on the Tr-Squabble Creek; earth-type dam, 40 ft tall and 1,594 ft long.
- Surface area
- 45 ac
- Normal storage
- 132 ac-ft
- Max storage
- 646 ac-ft
- Drainage area
- 1.17 sq mi
- Hazard class
- High
- Owner
- KAUFMAN VAN ZANDT ROCKWALL SWCD;ROCKWALL COUNTY
All listed purposes: Flood Risk Reduction;Fire Protection, Stock, Or Small Fish Pond;Recreation.
Source: USACE National Inventory of Dams, NID ID TX00804 · Operator website · Matched by proximity (0.07 km)
Graded lakes near Phelps Lake
Phelps Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Rockwall County
Frequently asked questions about Phelps Lake
Where is Phelps Lake?
- Phelps Lake is a lake in Rockwall 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 Phelps Lake?
- Phelps Lake in Rockwall County, Texas is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 0.6 ft visibility. Phosphorus: 180 µg/L. Chlorophyll-a (algae): 22 µg/L. Surface area: 45 acres.
Is Phelps Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Explore Phelps Lake across LakeQuality
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Where this data comes from
4 measurements from 1 monitoring station, 2020. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- USGS Texas Water Science Center
USGS-TX4 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.