Baumann Park Lake is a mesotrophic lake in Winnebago County, Illinois. Water quality is graded A based on 2 sampling years through 2021.
Source: EPA Water Quality Portal sampling records, Illinois DNR, last sampled 2021-10-18. Grade methodology: LakeGrade methodology.
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Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
Good clarity, visible to about 10.2 ft. Phosphorus level: 11.5 µg/L. Trophic State Index: 42.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 10.2 ft | B |
| Phosphorus | 11.5 µg/L | A |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 42 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Baumann Park Lake
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Fishing Baumann Park Lake
Water Temperature
Baumann Park Lake averages about 77°F at the surface in summer, usually warmest in Aug (about 80°F) and coldest in May (about 58°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 264 field readings (2011–2021) via the EPA Water Quality Portal. See the full Baumann Park Lake water temperature breakdown →
Location
County Ranking
Ranked #1 of 1 lakes in Winnebago County
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Mesotrophic Lakes in Illinois
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Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Regulated Pollution Sources Nearby
4 EPA-permitted facilities operate within about 5 miles of Baumann Park Lake under Clean Water Act (NPDES) discharge permits. 1 facility has a reported Clean Water Act violation in the past three years.
- Sandy Hollow Ccdd SiteRockford · 4.4 mi away · NPDES IL0079171Recent violation
- Bvr Technologies CompanyRockford · 2.4 mi away · NPDES IL0074349
- Thermoplastic IncRockford · 3.4 mi away · NPDES IL0076724
- Irene QuarryBelvidere · 4.3 mi away · NPDES IL0067741
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
Data Sources
Water quality data from the EPA Water Quality Portal
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Most recent sample: 2021-10-18
Monitoring stations: 2