O'Rourke Lake
Otsego County, Michigan36 acresView mapDirections
Not Rated: one monitoring station are on record, but they measured water clarity only. LakeQuality’s A–F method grades total phosphorus, total nitrogen, chlorophyll-a, and turbidity; clarity is shown, not scored.
- Public access
- Limited data
O'Rourke Lake in Otsego County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 15.5 ft visibility. Surface area: 35.7 acres.
- Clarity
- 15.5 ft
- Area
- 36 acres
- Trend
- ↑ Improving
- Public access
- Yes
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Watch O'Rourke Lake’s letter
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Why O'Rourke Lake has no grade
O'Rourke Lake has monitoring on record from one station, but only water clarity was measured. LakeQuality’s A–F letter uses total phosphorus, total nitrogen, chlorophyll-a, and turbidity against EPA National Lakes Assessment condition classes. With none of those grading measurements on record, O'Rourke Lake is Not Rated — not an F. Its 15.5-foot median from 21 readings collected 2022 is still shown as clarity, but clarity alone cannot earn a letter.
Not Rated is EPA Integrated Reporting Category 3 — insufficient information. Everything below that has been measured is still reported on this page.
Sampling is run by EGLE and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
O'Rourke Lake is a 36-acre lake in Otsego County, Michigan. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2022-09-17. Grade methodology: LakeQuality methodology.
What O'Rourke Lake is good for
From access and monitoring records, not editorial picks.
- Clear water15.5 ft of visibility
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for O'Rourke Lake
These readings exist but are not enough for an A–F grade — see why.
Crystal clear, you can see 15.5 ft down. TSI 38.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 15.5 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 38 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 36 acres |
| Public Access | Yes |
No bathymetric survey has been published for O'Rourke Lake, so its depth is not documented here.
Fishing O'Rourke Lake
Water Quality Trend: ↑ Improving
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +9.78 m/yr | 2 |
| Phosphorus | ↑ Improving | -1 µg/L/yr | 2 |
Graded lakes near O'Rourke Lake
O'Rourke Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Otsego County
Frequently asked questions about O'Rourke Lake
Where is O'Rourke Lake?
- O'Rourke Lake is a lake in Otsego County, Michigan. LakeQuality has not rated this lake (UNRATED) — the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity.
What is the water quality grade for O'Rourke Lake?
- O'Rourke Lake in Otsego County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 15.5 ft visibility. Surface area: 35.7 acres.
Is O'Rourke Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Explore O'Rourke Lake across LakeQuality
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Where this data comes from
21 measurements from 1 monitoring station, 2022. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- North American Lake Management Society
NALMS21 samples · 2022
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.