Coalgate City Lake
Coal County, Oklahoma406 acresView mapDirections
Oklahoma DEQ publishes the water-quality measurements for Coalgate City Lake. Here is what has been measured.
- 40 ft max depth
- Limited data
Coalgate City Lake in Coal County, Oklahoma has water-quality measurements published by Oklahoma DEQ, shown here as reported. Water clarity: 1 ft visibility. Surface area: 405.8 acres.
Coalgate City Lake is a 406-acre lake in Coal County, Oklahoma with an estimated average depth of about 40 feet. Overall water quality is improving over recent sampling years.
Source: EPA Water Quality Portal sampling records, ODEQ, last sampled 2024-10-16. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Coalgate City Lake is safe to swim in today is a call for the Oklahoma Department of Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Coalgate City Lake
These are the measurements Oklahoma DEQ publishes for Coalgate City Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Very murky, less than 1 ft of visibility. TSI 76.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 1ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 76 | Hypereutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Very high nutrients, dense algae, poor clarity
Ask about Coalgate City Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~40 ft est.
Surface area
406 acres
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Oklahoma has not published bathymetry for Coalgate City Lake.
Lake Size & Watershed
Watershed (drainage) area
11 sq mi
HydroLAKES / HydroSHEDS
Shoreline
5.9 mi
HydroLAKES / HydroSHEDS
Elevation
636 ft
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.
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Fishing Coalgate City Lake
Water quality readings over time
2 seasons of samples on record (2022–2024). Calling a direction takes at least 4 years of the same measurement.
Water clarity
Improving2 years
Reservoir Info (USACE NID)
Coalgate City Lake is a man-made reservoir impounded by the SCS-Caney Coon Creek Site-2 (completed 1965), built primarily for water supply on the Coon Creek; earth-type dam, 53 ft tall and 1,180 ft long.
- Surface area
- 405.8 ac
- Normal storage
- 3,873 ac-ft
- Max storage
- 16,351 ac-ft
- Drainage area
- 14.1 sq mi
- Hazard class
- High
- Owner
- COAL COUNTY CONSERVATION DISTRICT
Source: USACE National Inventory of Dams, NID ID OK01507 · Operator website · Matched by proximity (0.74 km)
Nearby Lakes in Coal County
Frequently asked questions about Coalgate City Lake
Where is Coalgate City Lake?
- Coalgate City Lake is a lake in Coal County, Oklahoma. Its water-quality measurements are published by Oklahoma DEQ and shown on this page as reported.
What is the water quality of Coalgate City Lake?
- Coalgate City Lake in Coal County, Oklahoma has water-quality measurements published by Oklahoma DEQ, shown here as reported. Water clarity: 1 ft visibility. Surface area: 405.8 acres.
Is Coalgate City Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Coalgate City Lake?
- No published bathymetric survey covers Coalgate City Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 40 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 405.8 acres.
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Where this data comes from
37 measurements from 5 monitoring stations, 2019–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- OWRB Lakes Monitoring
OKWRB-LAKES_WQX37 samples · 2019–2024
Analytical methods
- OWRB Lakes Field Data Collection
- Determination of Turbidity
Monitoring station identifiers (5)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)