Twin Valley Lake
Twin Valley Lake in Iowa County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 136 acres.
- Area
- 136 acres
- Public access
- Yes
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Why Twin Valley 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 Twin Valley 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 WI DNR and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Twin Valley Lake is a 136-acre lake in Iowa County, Wisconsin. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled recent years. Grade methodology: LakeQuality methodology.
Watch Twin Valley Lake water quality
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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 Twin Valley 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 Twin Valley Lake
Compare lakeside cabins, hotels, and vacation rentals near Twin Valley Lake in Iowa County, Wisconsin — 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 Twin Valley Lake
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DNR Reports & Resources
Wisconsin DNR Fisheries scientists publish multi-year survey reports for Twin Valley Lake covering fish populations, stocking, water quality, and management. 1 report on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- 2018Twin Valley Lake comprehensive survey 2018Comprehensive Survey · WI DNR · 2018 (PDF)
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 136 acres |
| Public Access | Yes |
No bathymetric survey has been published for Twin Valley Lake, so its depth is not documented here.
Recreation & Access
- Twin Valley LakePublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Twin Valley Lake
Nearby Lakes in Iowa County
Frequently asked questions about Twin Valley Lake
Where is Twin Valley Lake?
- Twin Valley Lake is a lake in Iowa County, Wisconsin. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Twin Valley Lake?
- Twin Valley Lake in Iowa County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 136 acres.
Is Twin Valley Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Twin Valley 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 Twin Valley Lake?
- Twin Valley Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Twin Valley Lake. Public access is listed as yes.
Explore Twin Valley Lake across LakeQuality
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Where this data comes from
Measurements for Twin Valley 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