Mandan Lake
Mandan Lake in Oliver County, North Dakota is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 29 acres.
- Area
- 29 acres
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Why Mandan Lake 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 Mandan Lake, no water-quality sampling on record for this lake.
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.
Mandan Lake is a 29-acre lake in Oliver County, North Dakota.
Source: EPA Water Quality Portal sampling records, NDDEQ, last sampled recent years. Grade methodology: LakeQuality methodology.
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Swimming Safety
Not ratedElevated nutrients
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Mandan Lake
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Trophic State Index: undefined.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) |
Where to stay near Mandan Lake
Compare lakeside cabins, hotels, and vacation rentals near Mandan Lake in Oliver 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 Mandan Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 29 acres |
No bathymetric survey has been published for Mandan Lake, so its depth is not documented here.
Fishing Mandan Lake
Nearby Lakes in Oliver County
Frequently asked questions about Mandan Lake
Where is Mandan Lake?
- Mandan Lake is a lake in Oliver County, North Dakota. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Mandan Lake?
- Mandan Lake in Oliver County, North Dakota is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 29 acres.
Is Mandan Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Mandan Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Explore Mandan Lake across LakeQuality
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Where this data comes from
Measurements for Mandan Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Other records on this page
Depth, fish, and access data from North Dakota Game & Fish