Green Lake is a 906-acre productive, nutrient-rich eutrophic lake in McIntosh County, North Dakota with a maximum depth of 11 feet (7-foot average). Water quality is graded D based on 1 sampling years through 2024. The lake supports 3 documented fish species including Walleye, Northern Pike, and Yellow Perch. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, North Dakota DNR, last sampled 2024-04-29. Grade methodology: LakeGrade methodology.
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Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Murky, only visible to about 4.9 ft. Trophic State Index: 54.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.9 ft | D |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 54 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 10.7 ft |
| Average Depth | 6.8 ft |
| Surface Area | 906 acres |
| Shoreline Length | 16.4 mi |
| Public Access | Yes |
Where to stay near Green Lake
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Fish Species
Click a species to see every graded lake where it is documented.
Fishing Green Lake
Recreation & Access
Water Temperature
Green Lake averages about 60°F at the surface in summer, usually warmest in Jul (about 60°F) and coldest in May (about 45°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 9 field readings (2019–2019) via the EPA Water Quality Portal. See the full Green Lake water temperature breakdown →
Location
County Ranking
Ranked #1 of 1 lakes in McIntosh County
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Green Lake holds Grade D. One nearby lake has a higher grade.
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High nutrients, frequent algae, reduced clarity
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More records, surveys & data sources
Reservoir Info (USACE NID)
Green Lake is a man-made reservoir impounded by the Green Lake Outlet Control (completed 1973), built primarily for recreation on the Pudwill Lake-TR; earth-type dam, 7 ft tall and 856 ft long.
- Surface area
- 906 ac
- Normal storage
- 5,436 ac-ft
- Max storage
- 8,622 ac-ft
- Drainage area
- 51 sq mi
- Hazard class
- Low
- Owner
- McIntosh County WRB
Source: USACE National Inventory of Dams, NID ID ND00373 · Operator website · Matched by proximity (0.85 km)
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Data Sources
Water quality data from the EPA Water Quality Portal
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Depth, fish, and access data from North Dakota Game & Fish
Public boat-access points from the USGS National Boat Ramps inventory
Most recent sample: 2024-04-29
Monitoring stations: 1