Twin Falls Flowage Us Twin Falls Dam Lake
Twin Falls Flowage Us Twin Falls Dam Lake in Florence County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 7 ft visibility. Maximum depth: 50 ft. Surface area: 570 acres.
- Clarity
- 7 ft
- Max depth
- 50 ft
- Area
- 570 acres
- Public access
- Yes
Next lake in Florence County
Why Twin Falls Flowage Us Twin Falls Dam Lake has no grade
We grade a lake only when its monitoring record clears the evidence bar: 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 Falls Flowage Us Twin Falls Dam Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded water clarity, but not phosphorus and algae (chlorophyll-a).
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 Falls Flowage Us Twin Falls Dam Lake is a 570-acre lake in Florence County, Wisconsin with a maximum depth of 50 feet. The lake supports 6 documented fish species including Musky, Panfish, and Largemouth Bass. Public access is available with 2 public boat landings.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2023-07-21. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Twin Falls Flowage Us Twin Falls Dam Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Moderate clarity, visible to about 7 ft. Trophic State Index: 49.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 7 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 49 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Twin Falls Flowage Us Twin Falls Dam Lake
Compare lakeside cabins, hotels, and vacation rentals near Twin Falls Flowage Us Twin Falls Dam Lake in Florence 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.
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Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 50 ft |
| Surface Area | 570 acres |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Bass LakePublic
- Twin Falls FlowageSemi-private
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Twin Falls Flowage Us Twin Falls Dam Lake
- → Twin Falls Flowage Us Twin Falls Dam Lake fishing forecast & best times (species outlook + 14-day solunar calendar)
- → Twin Falls Flowage Us Twin Falls Dam Lake fishing regulations (limits, seasons, special rules)
- → Is it safe to eat fish from Twin Falls Flowage Us Twin Falls Dam Lake? (mercury & PFAS guide)
Invasive & Introduced Species
Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. 2 stations on file (most recent sample 2023).
Fish Species (DNR-rated)
DNR Reports & Resources
Wisconsin DNR Fisheries scientists publish multi-year survey reports for Twin Falls Flowage Us Twin Falls Dam 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).
- 2016Twin Falls Flowage comprehensive survey 2016Comprehensive Survey · WI DNR · 2016 (PDF)
Reservoir Info (USACE NID)
Twin Falls Flowage Us Twin Falls Dam Lake is a man-made reservoir impounded by the Twin Falls Auxiliary Spillway (completed 1960), built primarily for hydroelectric on the Menominee River; concrete-type dam, 30 ft tall and 101 ft long.
- Surface area
- 960 ac
- Normal storage
- 9,750 ac-ft
- Max storage
- 9,750 ac-ft
- Drainage area
- 1,790 sq mi
- Hazard class
- High
- Owner
- Wisconsin Electric Power Company
All listed purposes: Hydroelectric;Recreation.
Source: USACE National Inventory of Dams, NID ID MI00143 · Operator website · Matched by proximity (0.22 km)
EPA Impairment Status
Twin Falls Flowage Us Twin Falls Dam Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit WI10026672 · Official waterbody report · Matched by proximity (2.99 km)
Graded lakes near Twin Falls Flowage Us Twin Falls Dam Lake
Twin Falls Flowage Us Twin Falls Dam Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Florence County
Frequently asked questions about Twin Falls Flowage Us Twin Falls Dam Lake
What is the water quality grade for Twin Falls Flowage Us Twin Falls Dam Lake?
- Twin Falls Flowage Us Twin Falls Dam Lake in Florence County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 7 ft visibility. Maximum depth: 50 ft. Surface area: 570 acres.
Is Twin Falls Flowage Us Twin Falls Dam Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Twin Falls Flowage Us Twin Falls Dam Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
How deep is Twin Falls Flowage Us Twin Falls Dam Lake?
- Twin Falls Flowage Us Twin Falls Dam Lake has a maximum depth of 50 feet. The lake covers 570 acres.
What fish are in Twin Falls Flowage Us Twin Falls Dam Lake?
- Fish species found in Twin Falls Flowage Us Twin Falls Dam Lake include Musky, Panfish, Largemouth Bass, Smallmouth Bass, Northern Pike, Walleye. Twin Falls Flowage Us Twin Falls Dam Lake is located in Florence County, Wisconsin.
Are there boat ramps on Twin Falls Flowage Us Twin Falls Dam Lake?
- Twin Falls Flowage Us Twin Falls Dam Lake has 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Bass Lake, Twin Falls Flowage. Public access is listed as yes.
Explore Twin Falls Flowage Us Twin Falls Dam Lake across LakeGrade
Depth, room, public access, and the state wake-sport rules
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Where this data comes from
1 measurement from 1 monitoring station, 2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX1 sample · 2023
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)
Fish and recreation data from Wisconsin DNR Lakes
Named boat-access points from the USGS National Boat Ramps inventory