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C

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.

MetricValueGrade
Water Clarity (Secchi Depth)6 ftD
Phosphorus22.4 µg/LB
Chlorophyll-a (Algae)No data
Trophic State Index (TSI)50Eutrophic

High nutrients, frequent algae, reduced clarity

Lake Details

CharacteristicValue
Maximum Depth43 ft
Surface Area82 acres
Public AccessYes

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.

Chinese Mystery Snail

Water Quality Trend: Improving

Based on 6 years of monitoring data (2020-2025).

MetricTrendChange/YearYears
Water Clarity Improving+0.164 m/yr6
Phosphorus Improving-0.76 µg/L/yr6
See year-by-year chart →

Recreation & Access

2
Boat Landings
Yes
Public Access

Location

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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.

See full comparison →

Nearby Lakes in Polk County

WI DNR Lake Profile

Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 1988. 1 station on file (most recent sample 2025).

DNR Assessment
Fair · Deep Seepage lake
Trophic State Index 59 (eutrophic) · 5-year average

Fish Species (DNR-rated)

Northern Pike(Common)Walleye(Common)Largemouth Bass(Present)

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

Nutrients (phosphorus, nitrogen)

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

Compare lakeside cabins, hotels, and vacation rentals near Ward Lake in Polk County, Wisconsin — live availability and prices for your trip.

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