Twin Lakes
LaMoure County, North DakotaView mapDirections
Not enough samples to grade — the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity. No letter yet. Here is what we do have.
- 64 ft max depth
- Public access
- Limited data
Twin Lakes in LaMoure County, North Dakota is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 14.1 ft visibility. Chlorophyll-a (algae): 3.2 µg/L.
- Clarity
- 14.1 ft
- Typical in August
- 64°F
- Max depth
- ~64 ft est.
- Chlorophyll-a
- 3.2 µg/L
- Trend
- ↓ Declining
- Public access
- Yes
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Stays near Twin Lakes
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Watch Twin Lakes’s letter
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Why Twin Lakes has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Twin Lakes, the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity. Sampling here has recorded water clarity and algae (chlorophyll-a), but not phosphorus.
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by NDDEQ and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Twin Lakes is a lake in LaMoure County, North Dakota with an estimated average depth of about 64 feet. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available.
Source: EPA Water Quality Portal sampling records, NDDEQ, last sampled 2021-10-01. Grade methodology: LakeQuality methodology.
What Twin Lakes is good for
From access and monitoring records, not editorial picks.
- Clear water14.1 ft of visibility
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Twin Lakes
These readings exist but are not enough for an A–F grade — see why.
Good clarity, visible to about 14.1 ft. Chlorophyll-a 3.2 µg/L. TSI 40.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 14.1 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | 3.2 µg/L | Not graded |
| Trophic State Index (TSI) | 40 | Mesotrophic |
Moderate nutrients, good water quality
Water Temperature
Twin Lakes typically sits around 64°F at the surface in August. Summer average is about 62°F. 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 →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~64 ft est. |
| Average Depth | ~12 ft est. |
| Public Access | Yes |
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 Twin Lakes.
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.
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 |
Graded lakes near Twin Lakes
Twin Lakes has no grade, but these lakes within a short drive do.
Nearby Lakes in LaMoure County
Frequently asked questions about Twin Lakes
Where is Twin Lakes?
- Twin Lakes is a lake in LaMoure County, North Dakota. LakeQuality has not rated this lake (UNRATED) — the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity.
What is the water quality grade for Twin Lakes?
- Twin Lakes in LaMoure County, North Dakota is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 14.1 ft visibility. Chlorophyll-a (algae): 3.2 µg/L.
Is Twin Lakes safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
What is the water temperature of Twin Lakes?
- Twin Lakes typically sits around 64°F at the surface in August, from 15 EPA Water Quality Portal field readings (2020–2021). That is a typical value for the month, not a live reading.
How deep is Twin Lakes?
- No published bathymetric survey covers Twin Lakes, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 64 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Explore Twin Lakes across LakeQuality
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Where this data comes from
9 measurements from 1 monitoring station, 2020–2021. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- North Dakota Department Of Environmental Quality
21NDHDWQ_WQX9 samples · 2020–2021
Analytical methods
- 447.0 ~ EPA; Chlorophyll a and b in phytoplankton by HPLC/UV
Monitoring station identifiers (1)
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)
Depth, fish, and access data from North Dakota Game & Fish