North Twin Lake
Polk County, Wisconsin129 acresView mapDirections
Wisconsin DNR publishes the water-quality measurements for North Twin Lake. Here is what has been measured.
- Oligotrophic
- 2 aquatic invasives
- 27 ft max depth
- Public access
- Limited data
North Twin Lake in Polk County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Phosphorus: 10.1 µg/L. Maximum depth: 27 ft. Surface area: 129 acres.
Wisconsin DNR rates Panfish as abundant on North Twin Lake. DNR survey details →
North Twin Lake is a 129-acre cold, clear oligotrophic lake in Polk County, Wisconsin with a maximum depth of 27 feet. Water clarity is declining over recent sampling years. The lake supports 4 documented fish species including Panfish, Largemouth Bass, and Northern Pike. Public access is available with 1 public boat landing. Compared to the 54 other monitored lakes in Polk County, North Twin Lake ranks #8 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2025-08-27. Methodology: how these readings are compared.
What North Twin Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
- Fishing4 species recorded
Swimming conditions
Readings onlyLimited data
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether North Twin Lake is safe to swim in today is a call for the Wisconsin Department of Natural Resources and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for North Twin Lake
These are the measurements Wisconsin DNR publishes for North Twin Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Phosphorus 10.1 µg/L. TSI 37.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | 10.1µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 37 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about North Twin Lake
Answers come straight from the public measurements and survey records on this page.
Wisconsin DNR rates Panfish as abundant on North Twin Lake.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows North Twin Lake’s water-quality measurements separately, and the water-quality trend over 6 years of monitoring is stable. Catch rate is not a swim clearance and is not a weekly bite report.
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. 1 station on file (most recent sample 2025).
Fish Species (DNR-rated)
Lake Details
Max depth
27 ft
Surface area
129 acres
Public access
Yes
Listed by Wisconsin DNR
Lake Size & Watershed
Watershed (drainage) area
2 sq mi
HydroLAKES / HydroSHEDS
Shoreline
2.1 mi
HydroLAKES / HydroSHEDS
Elevation
1,050 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- North Twin LakePublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
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Stays near North Twin Lake
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Fish Species
Click a species to see every lake where it is documented.
Fishing North Twin Lake
Invasive & Introduced Species
Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.
Water Quality Trend: Stable
Based on 6 years of monitoring (2020–2025).
Water clarity
Worsening5 years
Phosphorus
Improving-15.92 µg/L/yr4 years
Reservoir Info (USACE NID)
North Twin Lake is a man-made reservoir impounded by the Amery (completed 1888), built primarily for recreation on the Apple River; gravity-type dam, 13 ft tall and 190 ft long.
- Surface area
- 639 ac
- Normal storage
- 3,500 ac-ft
- Max storage
- 4,800 ac-ft
- Drainage area
- 134 sq mi
- Hazard class
- High
- Owner
- City Of Amery
Source: USACE National Inventory of Dams, NID ID WI00172 · Operator website · Matched by proximity (0.97 km)
Nearby Lakes in Polk County
Frequently asked questions about North Twin Lake
Where is North Twin Lake?
- North Twin Lake is a lake in Polk County, Wisconsin. Its water-quality measurements are published by Wisconsin DNR and shown on this page as reported.
What is the water quality of North Twin Lake?
- North Twin Lake in Polk County, Wisconsin has water-quality measurements published by Wisconsin DNR, shown here as reported. Phosphorus: 10.1 µg/L. Maximum depth: 27 ft. Surface area: 129 acres.
Is North Twin Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is North Twin Lake?
- North Twin Lake has a maximum depth of 27 feet. The lake covers 129 acres.
What fish are in North Twin Lake?
- Fish species found in North Twin Lake include Panfish, Largemouth Bass, Northern Pike, Walleye. North Twin Lake is located in Polk County, Wisconsin.
What did the DNR fisheries survey find at North Twin Lake?
- Wisconsin DNR rates Panfish as abundant on North Twin Lake. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows North Twin Lake’s water-quality measurements separately, and the water-quality trend over 6 years of monitoring is stable. Catch rate is not a swim clearance and is not a weekly bite report.
Are there boat ramps on North Twin Lake?
- North Twin Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include North Twin Lake. Public access is listed as yes.
Can I fish at North Twin Lake?
- North Twin Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by Wisconsin's fish and wildlife agency, so check its current regulations before you go.
Explore North Twin Lake across LakeQuality
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Where this data comes from
3 measurements from 1 monitoring station, 2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX3 samples · 2025
Analytical methods
- Phosphorus by Colorimetry
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
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