Mallard Marsh Swamp
Mallard Marsh Swamp in Cerro Gordo County, Iowa is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 31 acres.
- Area
- 31 acres
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Why Mallard Marsh Swamp 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 Mallard Marsh Swamp, 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 Iowa DNR and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Mallard Marsh Swamp is a 31-acre lake in Cerro Gordo County, Iowa.
Source: EPA Water Quality Portal sampling records, Iowa DNR, 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 Mallard Marsh Swamp
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 Mallard Marsh Swamp
Compare lakeside cabins, hotels, and vacation rentals near Mallard Marsh Swamp in Cerro Gordo County, Iowa — 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.
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 31 acres |
No bathymetric survey has been published for Mallard Marsh Swamp, so its depth is not documented here.
Fishing Mallard Marsh Swamp
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Frequently asked questions about Mallard Marsh Swamp
Where is Mallard Marsh Swamp?
- Mallard Marsh Swamp is a lake in Cerro Gordo County, Iowa. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Mallard Marsh Swamp?
- Mallard Marsh Swamp in Cerro Gordo County, Iowa is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 31 acres.
Is Mallard Marsh Swamp safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Mallard Marsh Swamp is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
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Where this data comes from
Measurements for Mallard Marsh Swamp come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.