Ingerson Lake
Allegan County, Michigan16 acresView mapDirections
Nutrients and algae sit mid-range for this region.
↓ down from B at the last regrade
- Mesotrophic
- #5 of 5 in the county
Ingerson Lake in Allegan County, Michigan has a water quality grade of C (Fair). Water clarity: 9 ft visibility. Phosphorus: 39 µg/L. Chlorophyll-a (algae): 1.4 µg/L. Surface area: 15.6 acres.
- Clarity
- 9 ft
- Typical in September
- 65°F
- Area
- 16 acres
- Type
- Mesotrophic
- Phosphorus
- 39 µg/L
- Chlorophyll-a
- 1.4 µg/L
- Trend
- ↓ Declining
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Watch Ingerson Lake’s letter
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Ingerson Lake is a 16-acre mesotrophic lake in Allegan County, Michigan. Water quality is graded C based on 1 sampling years through 2025. Overall water quality is declining over recent sampling years. Compared to the 4 other monitored lakes in Allegan County, Ingerson Lake ranks #5 for water quality.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2025-11-25. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyBacteria C
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.
Based on E. coli testing, Ingerson Lake occasionally exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 8.6% of 35 samples across 8 seasons.
This is a historical summary of past testing, not a current condition — bacteria levels change quickly, especially after rain. Always check Michigan’s current beach and health-department advisories before swimming.
Water Quality Grade: C (Fair)
Moderate clarity, visible to about 9 ft. Phosphorus 39 µg/L. Chlorophyll-a 1.4 µg/L. TSI 46. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 9 ft | Not graded |
| Phosphorus | 39 µg/L | Fair |
| Chlorophyll-a (Algae) | 1.4 µg/L | Not graded |
| Trophic State Index (TSI) | 46 | Mesotrophic |
Moderate nutrients, good water quality
Water Temperature
Ingerson Lake typically sits around 65°F at the surface in September. Summer average is about 67°F. Usually warmest in Jul (about 68°F) and coldest in Jan (about 39°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 679 field readings (2012–2024) via the EPA Water Quality Portal. See the full Ingerson Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 16 acres |
No bathymetric survey has been published for Ingerson Lake, so its depth is not documented here.
Fishing Ingerson Lake
Water Quality Trend: ↓ Declining
Based on 10 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.2 m/yr | 2 |
| Phosphorus | ↓ Declining | +12.16 µg/L/yr | 8 |
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Ingerson Lake under Clean Water Act (NPDES) discharge permits.
- John Schaendorf DairyAllegan · 3.9 mi away · NPDES MIG440012
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 #5 of 5 lakes in Allegan County
Nearby Lakes in Allegan County
Frequently asked questions about Ingerson Lake
Where is Ingerson Lake?
- Ingerson Lake is a lake in Allegan County, Michigan. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Ingerson Lake?
- Ingerson Lake in Allegan County, Michigan has a water quality grade of C (Fair). Water clarity: 9 ft visibility. Phosphorus: 39 µg/L. Chlorophyll-a (algae): 1.4 µg/L. Surface area: 15.6 acres.
Is Ingerson Lake safe to swim in?
- Based on E. coli testing, Ingerson Lake occasionally exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 8.6% of 35 samples across 8 seasons. That works out to a bacteria swim-safety grade of C — a historical summary of past testing, not a current reading. Ingerson Lake has a water quality grade of C (Fair). Bacteria levels can spike quickly after heavy rain, so always check Michigan's current beach and health-department advisories before you swim.
What is the water temperature of Ingerson Lake?
- Ingerson Lake typically sits around 65°F at the surface in September, from 679 EPA Water Quality Portal field readings (2012–2024). That is a typical value for the month, not a live reading.
Explore Ingerson Lake across LakeQuality
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Where this data comes from
683 measurements from 1 monitoring station, 2016–2025. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- Match-e-be-nash-she-wish Band of Pottawatomi Indians of Michigan (Gun Lake)
GNLK01_WQX683 samples · 2016–2025
Analytical methods
- 4500 P E ~ Phosphorus in Water by Colorimetry- Ascorbic Acid Method
- 10200 H ~ Chlorophyll a-b-c Determination
- Turbidity in Water
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
Regulated discharger data from EPA ECHO (ICIS-NPDES)