Green Lake
McIntosh County, North Dakota906 acresView mapDirections
No nutrient or algae sampling on record from ND DEQ for this lake.
- 29 ft max depth
- Public access
- Limited data
Green Lake in McIntosh County, North Dakota has water-quality measurements published by ND DEQ, shown here as reported. Surface area: 906 acres.
Green Lake is a 906-acre lake in McIntosh County, North Dakota with an estimated average depth of about 29 feet. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, NDDEQ, last sampled 2024-04-29. Methodology: how these readings are compared.
What Green Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Green Lake is safe to swim in today is a call for the North Dakota Department of Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Green Lake
These are the measurements ND DEQ publishes for Green Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data.
Ask about Green Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Green Lake typically sits around 55°F at the surface in September. Summer average is about 60°F. Usually warmest in Jul (about 60°F) and coldest in May (about 45°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (45°F) to its warmest (60°F).
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 →
Lake Details
Max depth
~29 ft est.
Surface area
906 acres
Public access
Yes
Listed by ND DEQ
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. North Dakota has not published bathymetry for Green Lake.
Lake Size & Watershed
Watershed (drainage) area
8 sq mi
HydroLAKES / HydroSHEDS
Shoreline
6.7 mi
HydroLAKES / HydroSHEDS
Elevation
1,991 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.
Recreation & Access
- Green LakePublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Stays via Stay22
Stays near Green Lake
Compare lakeside cabins, hotels, and vacation rentals near Green Lake in McIntosh County, North Dakota — 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.
Top-rated places to stay near Green Lake
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Planning a trip? Cabins and lodging at Green Lake → · more North Dakota lake trips
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Fishing Green Lake
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)
Nearby Lakes in McIntosh County
Frequently asked questions about Green Lake
Where is Green Lake?
- Green Lake is a lake in McIntosh County, North Dakota. Its water-quality measurements are published by ND DEQ and shown on this page as reported.
What is the water quality of Green Lake?
- Green Lake in McIntosh County, North Dakota has water-quality measurements published by ND DEQ, shown here as reported. Surface area: 906 acres.
Is Green Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
What is the water temperature of Green Lake?
- Green Lake typically sits around 55°F at the surface in September, from 9 EPA Water Quality Portal field readings (2019–2019). That is a typical value for the month, not a live reading.
How deep is Green Lake?
- No published bathymetric survey covers Green Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 29 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 906 acres.
Are there boat ramps on Green Lake?
- Green Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Green Lake. Public access is listed as yes.
Can I fish at Green Lake?
- Green Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by North Dakota's fish and wildlife agency, so check its current regulations before you go.
Explore Green Lake across LakeQuality
Depth, room, public access, and the state wake-sport rules
Species activity outlook by water temperature and season
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Where this data comes from
1 measurement from 1 monitoring station, 2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- North Dakota Department Of Environmental Quality
21NDHDWQ_WQX1 sample · 2024
Monitoring station identifiers (1)
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)
Depth, fish, and access data from North Dakota Game & Fish
Named boat-access points from the USGS National Boat Ramps inventory