Baumann Park Lake
Winnebago County, IllinoisView mapDirections
Clarity, phosphorus, and algae all sit in the cleanest band for this region.
- Mesotrophic
- #1 of 1 in the county
- 16 ft max depth
- Limited data
Baumann Park Lake in Winnebago County, Illinois has a water quality grade of A (Excellent). Water clarity: 10.2 ft visibility. Phosphorus: 13.5 µg/L. Chlorophyll-a (algae): 6.1 µg/L.
- Clarity
- 10.2 ft
- Typical in August
- 80°F
- Max depth
- ~16 ft est.
- Type
- Mesotrophic
- Phosphorus
- 13.5 µg/L
- Chlorophyll-a
- 6.1 µg/L
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Watch Baumann Park Lake’s letter
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Baumann Park Lake is a mesotrophic lake in Winnebago County, Illinois with an estimated average depth of about 16 feet. Water quality is graded A based on 2 sampling years through 2021.
Source: EPA Water Quality Portal sampling records, Illinois EPA, last sampled 2021-10-18. Grade methodology: LakeQuality methodology.
What Baumann Park Lake is good for
From access and monitoring records, not editorial picks.
- Clear water10.2 ft of visibility
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.
The A is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: A (Excellent)
Good clarity, visible to about 10.2 ft. Phosphorus 13.5 µg/L. Chlorophyll-a 6.1 µg/L. TSI 45. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 10.2 ft | Not graded |
| Phosphorus | 13.5 µg/L | Good |
| Chlorophyll-a (Algae) | 6.1 µg/L | Good |
| Trophic State Index (TSI) | 45 | Mesotrophic |
Moderate nutrients, good water quality
Water Temperature
Baumann Park Lake typically sits around 80°F at the surface in August. Summer average is about 77°F. 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 →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~16 ft est. |
| Average Depth | ~8 ft est. |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Illinois has not published bathymetry for Baumann Park Lake.
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Fishing Baumann Park Lake
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.
County Ranking
Ranked #1 of 1 lakes in Winnebago County
Nearby Lakes in Winnebago County
Frequently asked questions about Baumann Park Lake
Where is Baumann Park Lake?
- Baumann Park Lake is a lake in Winnebago County, Illinois. LakeQuality grades it A for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Baumann Park Lake?
- Baumann Park Lake in Winnebago County, Illinois has a water quality grade of A (Excellent). Water clarity: 10.2 ft visibility. Phosphorus: 13.5 µg/L. Chlorophyll-a (algae): 6.1 µg/L.
Is Baumann Park Lake safe to swim in?
- The A is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
What is the water temperature of Baumann Park Lake?
- Baumann Park Lake typically sits around 80°F at the surface in August, from 264 EPA Water Quality Portal field readings (2011–2021). That is a typical value for the month, not a live reading.
How deep is Baumann Park Lake?
- No published bathymetric survey covers Baumann Park Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 16 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Explore Baumann Park Lake across LakeQuality
8.1 mi away · cable-pulled, no boat wake
Species activity outlook by water temperature and season
Where to stay at Illinois's top lakes, each with its grade
Moderate nutrients, good water quality
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Where this data comes from
36 measurements from 2 monitoring stations, 2021. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- illinois epa
IL_EPA_WQX36 samples · 2021
Analytical methods
- MEASURED IN FIELD
- Phosphorus by Colorimetry
- 10200 H 2 ~ Chlorophyll a-b-c Determination by spectrophotometer
Monitoring station identifiers (2)
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
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)