Ward Lake
Polk County, WisconsinEutrophic
Ward Lake sits at a C on the grading scale — not impaired, not pristine, with summer measurements that vary year to year. Clarity is the limiting factor — phosphorus is reasonable but suspended particles or algal cells keep water transparency below Wisconsin norms.
A TSI in the eutrophic range signals a lake doing what nutrient-loaded waters do — supporting an active algal community at the cost of clear water. Ward Lake reaches 43 ft at its deepest point — typical for Wisconsin mid-sized lakes, with seasonal stratification but limited cold-water refuge. At 82 acres, Ward Lake sits below the Wisconsin median: a small water where shoreline activity has an outsized effect on water quality. Within Polk County's 74 graded lakes, Ward Lake ranks 42 — below the local median, though not at the bottom.
An invasive species record — Chinese Mystery Snail — has been logged at Ward Lake; Wisconsin DNR maintains the official infested-waters list. The fishery includes walleye alongside the lake's other 3 documented species — a notable draw for Wisconsin anglers. A documented public access point at Ward Lake makes the lake usable for shore fishing, paddle craft, and trailered boats. The grade is based on limited monitoring — fewer than three independent measurement years contribute, so future updates may shift the letter.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-05-29. Grade methodology: LakeGrade methodology.
Watch Ward Lake water quality
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Murky, only visible to about 6 ft. Phosphorus level: 22.4 µg/L. Trophic State Index: 50.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6 ft | D |
| Phosphorus | 22.4 µg/L | B |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 50 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 43 ft |
| Surface Area | 82 acres |
| Public Access | Yes |
Fish Species
Click a species to see every graded lake where it is documented.
→ Best fishing times for Ward Lake (14-day solunar calendar)
→ Is it safe to eat fish from Ward Lake? (mercury & PFAS guide)
→ Ward Lake fishing regulations (limits, seasons, special rules)
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: ↑ Improving
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.164 m/yr | 6 |
| Phosphorus | ↑ Improving | -0.76 µg/L/yr | 6 |
Recreation & Access
Location
County Ranking
Ranked #42 of 74 lakes in Polk County
Cleaner Lakes Within 30 Miles
Ward Lake holds Grade C. 3 nearby lakes hold higher grades.
- AMargaret LakePolk County · mi · Two grade letters higher (C → A)
- BMckenzie LakePolk County · mi · Higher grade (C → B)
- BCrescent LakePolk County · mi · Higher grade (C → B)
Nearby Lakes in Polk County
More Wisconsin Lake Rankings
State Parks Near Ward Lake
Other Grade C Lakes in Wisconsin
Eutrophic Lakes in Wisconsin
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 1988. 1 station on file (most recent sample 2025).
Fish Species (DNR-rated)
EPA Impairment Status
Ward Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5R).
Causes of impairment
Source: EPA ATTAINS assessment unit WI10006733 · Official waterbody report
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Grading methodology based on Metropolitan Council standards
Fish and recreation data from Wisconsin DNR Lakes
Public boat-access points from the USGS National Boat Ramps inventory
Most recent sample: 2026-05-29
Monitoring stations: 2
Where to stay near Ward Lake
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