Ray Roberts Lake Site
Denton County, TexasView mapDirections
Nutrients and algae run above the regional average.
↓ down from B at the last regrade
- Eutrophic
- #3 of 6 in the county
- 91 ft max depth
- Public access
Ray Roberts Lake Site in Denton County, Texas has a water quality grade of D (Nutrient-rich). Water clarity: 3.9 ft visibility. Phosphorus: 20.1 µg/L. Chlorophyll-a (algae): 15.6 µg/L.
- Clarity
- 3.9 ft
- Max depth
- ~91 ft est.
- Type
- Eutrophic
- Phosphorus
- 20.1 µg/L
- Chlorophyll-a
- 15.6 µg/L
- Trend
- ↓ Declining
- Public access
- Yes
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Stays near Ray Roberts Lake Site
Compare lakeside cabins, hotels, and vacation rentals near Ray Roberts Lake Site in Denton County, Texas — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Ray Roberts Lake Site are listed below.
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Ray Roberts Lake Site is a productive, nutrient-rich eutrophic lake in Denton County, Texas with an estimated average depth of about 91 feet. Water quality is graded D based on 2 sampling years through 2025. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available with 6 public boat landings. Compared to the 5 other monitored lakes in Denton County, Ray Roberts Lake Site ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, TCEQ, last sampled 2025-12-17. Grade methodology: LakeQuality methodology.
What Ray Roberts Lake Site is good for
From access and monitoring records, not editorial picks.
- Boat launch6 documented ramps
Swimming Safety
Grade onlyAlgae risk
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 D is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: D (Nutrient-rich)
Murky, only visible to about 3.9 ft. Phosphorus 20.1 µg/L. Chlorophyll-a 15.6 µg/L. TSI 54. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.9 ft | Not graded |
| Phosphorus | 20.1 µg/L | Good |
| Chlorophyll-a (Algae) | 15.6 µg/L | Poor |
| Trophic State Index (TSI) | 54 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~91 ft est. |
| 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 Ray Roberts Lake Site.
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
- Ray Roberts Lake State Park - Buck CreekPublic
- Ray Roberts MarinaPublic
- State Park, Johnson Branch UnitPublic
- Lake Ray Roberts State Park - Pond CreekPublic
- Lake Ray Roberts State Park - Isle du BoisPublic
- Lake Ray Roberts State Park - SangerSemi-private
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Ray Roberts Lake Site
Water Quality Trend: ↓ Declining
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.08 m/yr | 4 |
County Ranking
Ranked #3 of 6 lakes in Denton County
Nearby Lakes in Denton County
Frequently asked questions about Ray Roberts Lake Site
Where is Ray Roberts Lake Site?
- Ray Roberts Lake Site is a lake in Denton County, Texas. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Ray Roberts Lake Site?
- Ray Roberts Lake Site in Denton County, Texas has a water quality grade of D (Nutrient-rich). Water clarity: 3.9 ft visibility. Phosphorus: 20.1 µg/L. Chlorophyll-a (algae): 15.6 µg/L.
Is Ray Roberts Lake Site safe to swim in?
- The D is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
How deep is Ray Roberts Lake Site?
- No published bathymetric survey covers Ray Roberts Lake Site, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 91 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Are there boat ramps on Ray Roberts Lake Site?
- Ray Roberts Lake Site has 6 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Ray Roberts Lake State Park - Buck Creek, Ray Roberts Marina, State Park, Johnson Branch Unit, Lake Ray Roberts State Park - Pond Creek, among others. Public access is listed as yes.
Explore Ray Roberts Lake Site across LakeQuality
More Texas Lake Rankings
Other Grade D Lakes in Texas
Eutrophic Lakes in Texas
Where this data comes from
121 measurements from 3 monitoring stations, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Texas Commission on Environmental Quality
TCEQMAIN121 samples · 2020–2025
Monitoring station identifiers (3)
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