Greenbelt Lake
Donley County, Texas2,020 acresView mapDirections
Not enough samples to grade — the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity. No letter yet. Here is what we do have.
- Impaired · Algal growth
- 60 ft max depth
- Public access
- Limited data
Greenbelt Lake in Donley County, Texas is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 2.1 ft visibility. Phosphorus: 30 µg/L. Chlorophyll-a (algae): 17.9 µg/L. Surface area: 2020 acres.
- Clarity
- 2.1 ft
- Max depth
- ~60 ft est.
- Area
- 2,020 acres
- Phosphorus
- 30 µg/L
- Chlorophyll-a
- 17.9 µg/L
- Trend
- ↓ Declining
- Public access
- Yes
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Watch Greenbelt Lake’s letter
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Why Greenbelt 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 Greenbelt Lake, the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity. 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.
Greenbelt Lake is a 2,020-acre lake in Donley County, Texas with an estimated average depth of about 60 feet. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available with 4 public boat landings.
Source: EPA Water Quality Portal sampling records, TCEQ, last sampled 2024-12-10. Grade methodology: LakeQuality methodology.
What Greenbelt Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch4 documented ramps
- Big water2,020 acres
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Greenbelt Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth. Check local advisories before you swim.
Water quality measurements for Greenbelt Lake
These readings exist but are not enough for an A–F grade — see why.
Very murky, less than 2.1 ft of visibility. Phosphorus 30 µg/L. Chlorophyll-a 17.9 µg/L. TSI 59.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.1 ft | Not graded |
| Phosphorus | 30 µg/L | Not graded |
| Chlorophyll-a (Algae) | 17.9 µg/L | Not graded |
| Trophic State Index (TSI) | 59 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Current Conditions
USGS snapshot Sep 7, 2026, 3:30 PM from gauge 07299840 (Greenbelt Lk nr Clarendon, TX). Station page ↗ — a live reading replaces this snapshot when the gauge responds. Missing live data is not an all-clear.
→ Greenbelt Lake water level: the live USGS gauge reading
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~60 ft est. |
| Surface Area | 2,020 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 Greenbelt 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
- North Shore CampgroundPublic
- Lakeside MarinaPublic
- Kincaid Park CampgroundPublic
- Kelly Creek SouthPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Greenbelt Lake
Water Quality Trend: ↓ Declining
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.599 m/yr | 4 |
| Phosphorus | ↓ Declining | +20 µg/L/yr | 2 |
| Chlorophyll-a | ↓ Declining | +0.6 µg/L/yr | 2 |
Reservoir Info (USACE NID)
Greenbelt Lake is a man-made reservoir impounded by the Greenbelt Dam (completed 1968), built primarily for water supply on the Salt Fork Red River; earth-type dam, 111 ft tall and 8,300 ft long.
- Surface area
- 2,020 ac
- Normal storage
- 59,800 ac-ft
- Max storage
- 100,500 ac-ft
- Drainage area
- 266 sq mi
- Hazard class
- High
- Owner
- GREENBELT MUNICIPAL & INDUSTRIAL WATER AUTHORITY
All listed purposes: Water Supply;Recreation.
Source: USACE National Inventory of Dams, NID ID TX03698 · Operator website
EPA Impairment Status
Greenbelt Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit TX-0223_01 · Official waterbody report
Graded lakes near Greenbelt Lake
Greenbelt Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Donley County
Frequently asked questions about Greenbelt Lake
Where is Greenbelt Lake?
- Greenbelt Lake is a lake in Donley County, Texas. LakeQuality has not rated this lake (UNRATED) — the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity.
What is the water quality grade for Greenbelt Lake?
- Greenbelt Lake in Donley County, Texas is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 2.1 ft visibility. Phosphorus: 30 µg/L. Chlorophyll-a (algae): 17.9 µg/L. Surface area: 2020 acres.
Is Greenbelt Lake safe to swim in?
- The letter is not a swimming clearance. Greenbelt Lake is listed impaired under Clean Water Act §303(d) (IR 5) for algal growth. Check local advisories before you swim.
How deep is Greenbelt Lake?
- No published bathymetric survey covers Greenbelt Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 60 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 2020 acres.
What is the water level at Greenbelt Lake?
- The USGS snapshot on this page for Greenbelt Lake is 2607.61 ft of water-surface elevation, recorded Sep 7, 2026, 3:30 PM at gauge 07299840. Current Conditions hydrates a live NWIS reading from that same station when the gauge responds. A missed live fetch is not an all-clear.
Are there boat ramps on Greenbelt Lake?
- Greenbelt Lake has 4 documented boat landings in the USGS National Boat Ramps inventory. Named access points include North Shore Campground, Lakeside Marina, Kincaid Park Campground, Kelly Creek South. Public access is listed as yes.
Explore Greenbelt Lake across LakeQuality
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Where this data comes from
38 measurements from 4 monitoring stations, 2020–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Texas Commission on Environmental Quality
TCEQMAIN20 samples · 2020–2024 - USGS Texas Water Science Center
USGS-TX18 samples · 2020–2023
Monitoring station identifiers (4)
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
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)
Named boat-access points from the USGS National Boat Ramps inventory