Eucha Lake
Delaware County, Oklahoma2,860 acresView mapDirections
Nutrients and algae run above the regional average.
↓ down from C at the last regrade
- Eutrophic
- #2 of 2 in the county
- 52 ft max depth
- Public access
- Limited data
Eucha Lake in Delaware County, Oklahoma has a water quality grade of D (Nutrient-rich). Water clarity: 3.1 ft visibility. Phosphorus: 36 µg/L. Surface area: 2860 acres.
- Clarity
- 3.1 ft
- Max depth
- ~52 ft est.
- Area
- 2,860 acres
- Type
- Eutrophic
- Phosphorus
- 36 µg/L
- Trend
- ↑ Improving
- Public access
- Yes
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Compare lakeside cabins, hotels, and vacation rentals near Eucha Lake in Delaware County, Oklahoma — 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 Eucha Lake are listed below.
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Eucha Lake is a 2,860-acre productive, nutrient-rich eutrophic lake in Delaware County, Oklahoma with an estimated average depth of about 52 feet. Water quality is graded D based on 1 sampling years through 2024. 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 Delaware County, Eucha Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, ODEQ, last sampled 2024-09-24. Grade methodology: LakeQuality methodology.
What Eucha Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch2 documented ramps
- Big water2,860 acres
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 D is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: D (Nutrient-rich)
Very murky, less than 3.1 ft of visibility. Phosphorus 36 µg/L. TSI 58. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.1 ft | Not graded |
| Phosphorus | 36 µg/L | Poor |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 58 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Current Conditions
USGS snapshot Sep 7, 2026, 3:45 PM from gauge 07191285 (Lake Eucha near Eucha, OK). Station page ↗ — a live reading replaces this snapshot when the gauge responds. Missing live data is not an all-clear.
→ Eucha Lake water level: the live USGS gauge reading
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~52 ft est. |
| Surface Area | 2,860 acres |
| Public Access | Yes |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Oklahoma has not published bathymetry for Eucha 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
- Upper Spavinaw Recreation AreaPublic
- Highway 10Public
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Eucha Lake
Water Quality Trend: ↑ Improving
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +10 m/yr | 2 |
| Phosphorus | → Stable | 0 µg/L/yr | 2 |
Reservoir Info (USACE NID)
Eucha Lake is a man-made reservoir impounded by the Eucha (completed 1952), built primarily for water supply on the Spavinaw Creek; earth-type dam, 95 ft tall and 200 ft long.
- Surface area
- 2,860 ac
- Normal storage
- 79,600 ac-ft
- Max storage
- 119,000 ac-ft
- Drainage area
- 360 sq mi
- Hazard class
- High
- Owner
- City of Tulsa
Source: USACE National Inventory of Dams, NID ID OK11026 · Operator website
County Ranking
Ranked #2 of 2 lakes in Delaware County
Nearby Lakes in Delaware County
Frequently asked questions about Eucha Lake
Where is Eucha Lake?
- Eucha Lake is a lake in Delaware County, Oklahoma. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Eucha Lake?
- Eucha Lake in Delaware County, Oklahoma has a water quality grade of D (Nutrient-rich). Water clarity: 3.1 ft visibility. Phosphorus: 36 µg/L. Surface area: 2860 acres.
Is Eucha Lake safe to swim in?
- The D is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
How deep is Eucha Lake?
- No published bathymetric survey covers Eucha Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 52 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 2860 acres.
What is the water level at Eucha Lake?
- The USGS snapshot on this page for Eucha Lake is 772.48 ft of gage height, recorded Sep 7, 2026, 3:45 PM at gauge 07191285. 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 Eucha Lake?
- Eucha Lake has 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Upper Spavinaw Recreation Area, Highway 10. Public access is listed as yes.
Explore Eucha Lake across LakeQuality
2 documented falls within 17.3 mi, nearest Natural Falls
Species activity outlook by water temperature and season
Where to stay at Oklahoma's top lakes, each with its grade
High nutrients, frequent algae, reduced clarity
Oklahoma's cleanest and most-polluted lakes, ranked
More Oklahoma Lake Rankings
Other Grade D Lakes in Oklahoma
Eutrophic Lakes in Oklahoma
Where this data comes from
89 measurements from 8 monitoring stations, 2017–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Cherokee Nation (Tribal)
CHEROKEE_WQX48 samples · 2018–2019 - OWRB Lakes Monitoring
OKWRB-LAKES_WQX41 samples · 2017–2024
Analytical methods
- OWRB Lakes Field Data Collection
- Determination of Turbidity
- CN_QAPP
Monitoring station identifiers (8)
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