Sixmile Lake
Sixmile Lake in Marshall County, South Dakota is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 109 acres.
- Area
- 109 acres
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Why Sixmile 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 Sixmile 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 SD DANR and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Sixmile Lake is a 109-acre lake in Marshall County, South Dakota.
Source: EPA Water Quality Portal sampling records, SD DANR, 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 Sixmile 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 Sixmile Lake
Compare lakeside cabins, hotels, and vacation rentals near Sixmile Lake in Marshall County, South 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 Sixmile Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 109 acres |
No bathymetric survey has been published for Sixmile Lake, so its depth is not documented here.
Recreation & Access
- Six Mile Public Water AccessPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Sixmile Lake
Nearby Lakes in Marshall County
Frequently asked questions about Sixmile Lake
Where is Sixmile Lake?
- Sixmile Lake is a lake in Marshall County, South Dakota. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Sixmile Lake?
- Sixmile Lake in Marshall County, South Dakota is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 109 acres.
Is Sixmile Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Sixmile Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Are there boat ramps on Sixmile Lake?
- Sixmile Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Six Mile Public Water Access.
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Where this data comes from
Measurements for Sixmile Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Other records on this page
Named boat-access points from the USGS National Boat Ramps inventory