Twin Lakes is a 1,736-acre mesotrophic lake in LaMoure County, North Dakota with a maximum depth of 40 feet (17-foot average). Water quality is graded A based on 2 sampling years through 2021. Overall water quality is declining over recent sampling years. The lake supports 3 documented fish species including Yellow Perch, Walleye, and Northern Pike. Public access is available with 1 public boat landing. Compared to the 3 other monitored lakes in LaMoure County, Twin Lakes ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, North Dakota DNR, last sampled 2021-10-01. Grade methodology: LakeGrade methodology.
Watch Twin Lakes water quality
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Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
Good clarity, visible to about 14.1 ft. Chlorophyll-a: 3.2 µg/L. Trophic State Index: 40.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 14.1 ft | B |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 3.2 µg/L | A |
| Trophic State Index (TSI) | 40 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 40.3 ft |
| Average Depth | 17.3 ft |
| Surface Area | 1,736 acres |
| Shoreline Length | 32.9 mi |
| Public Access | Yes |
Where to stay near Twin Lakes
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Fish Species
Click a species to see every graded lake where it is documented.
Fishing Twin Lakes
Water Quality Trend: ↓ Declining
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -1.45 m/yr | 2 |
Recreation & Access
Water Temperature
Twin Lakes averages about 62°F at the surface in summer, usually warmest in Aug (about 64°F) and coldest in May (about 46°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 15 field readings (2020–2021) via the EPA Water Quality Portal. See the full Twin Lakes water temperature breakdown →
Location
County Ranking
Ranked #1 of 4 lakes in LaMoure County
Nearby Lakes in LaMoure County
Explore Twin Lakes across LakeGrade
Fish species and top-graded lakes across North Dakota
Fish species and best lakes in LaMoure County
Species activity outlook by water temperature and season
Where to stay at North Dakota's top lakes, each with its grade
Moderate nutrients, good water quality
North Dakota's cleanest and most-polluted lakes, ranked
More North Dakota Lake Rankings
Other Grade A Lakes in North Dakota
Mesotrophic Lakes in North Dakota
Compare Twin Lakes With Nearby Lakes
More records, surveys & data sources
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: 2021-10-01
Monitoring stations: 1