South Red Iron Lake
South Red Iron Lake in Marshall County, South Dakota is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 624 acres.
- Area
- 624 acres
Next lake in Marshall County
Swipe left or right on this bar to open the next or previous lake.
Why South Red Iron 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 South Red Iron 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.
South Red Iron Lake is a 624-acre lake in Marshall County, South Dakota.
Source: EPA Water Quality Portal sampling records, SD DANR, last sampled recent years. Grade methodology: LakeQuality methodology.
Watch South Red Iron Lake water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Not ratedElevated nutrients
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for South Red Iron 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 South Red Iron Lake
Compare lakeside cabins, hotels, and vacation rentals near South Red Iron 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 South Red Iron Lake
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 624 acres |
No bathymetric survey has been published for South Red Iron Lake, so its depth is not documented here.
Recreation & Access
- South Red Iron Public Water AccessPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing South Red Iron Lake
Nearby Lakes in Marshall County
Frequently asked questions about South Red Iron Lake
Where is South Red Iron Lake?
- South Red Iron 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 South Red Iron Lake?
- South Red Iron Lake in Marshall County, South Dakota is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 624 acres.
Is South Red Iron Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. South Red Iron 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 South Red Iron Lake?
- South Red Iron Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include South Red Iron Public Water Access.
Explore South Red Iron Lake across LakeQuality
More South Dakota Lake Rankings
Other Lakes in South Dakota
Where this data comes from
Measurements for South Red Iron 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