North Twin Lake
North Twin Lake in Polk County, Wisconsin has a water quality grade of B (Good). 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 →
- Max depth
- 27 ft
- Area
- 129 acres
- Type
- Oligotrophic
- Trend
- → Stable
- Public access
- Yes
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North Twin Lake is a 129-acre cold, clear oligotrophic lake in Polk County, Wisconsin with a maximum depth of 27 feet. Water quality is graded B based on 1 sampling years through 2025. 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. Grade methodology: LakeQuality methodology.
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Swimming Safety
Grade onlyLimited data
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Good for swimming, clear water with low algae levels
Water Quality Grade: B (Good)
No clarity data. Phosphorus level: 10.1 µg/L. Trophic State Index: 37.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 10.1 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 37 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near North Twin Lake
Compare lakeside cabins, hotels, and vacation rentals near North Twin Lake in Polk 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 North Twin Lake
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Wisconsin DNR rates Panfish as abundant on North Twin Lake.
A DNR fisheries survey reports fish abundance and catch rates, not a water-quality grade. LakeQuality grades North Twin Lake B from EPA Water Quality Portal chemistry, 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
| Characteristic | Value |
|---|---|
| Maximum Depth | 27 ft |
| Surface Area | 129 acres |
| Public Access | Yes |
Lake Size & Watershed
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
Fish Species
Click a species to see every graded 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 data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.226 m/yr | 5 |
| Phosphorus | ↑ Improving | -15.92 µg/L/yr | 4 |
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)
County Ranking
Ranked #8 of 55 lakes in Polk County
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. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for North Twin Lake?
- North Twin Lake in Polk County, Wisconsin has a water quality grade of B (Good). Phosphorus: 10.1 µg/L. Maximum depth: 27 ft. Surface area: 129 acres.
Is North Twin Lake safe to swim in?
- Good for swimming, clear water with low algae levels. North Twin Lake has a water quality grade of B (Good). Always check local health department advisories before swimming.
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 a water-quality grade. LakeQuality grades North Twin Lake B from EPA Water Quality Portal chemistry, 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.
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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)
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
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