Rennie Lake
Grand Traverse County, Michigan226 acresView mapDirections
Clarity, phosphorus, and algae all sit in the cleanest band for this region.
- Mesotrophic
- #2 of 5 in the county
- 27 ft max depth
Rennie Lake in Grand Traverse County, Michigan has a water quality grade of A (Excellent). Water clarity: 14 ft visibility. Phosphorus: 8 µg/L. Chlorophyll-a (algae): 3.5 µg/L. Maximum depth: 27 ft. Surface area: 225.8 acres.
- Clarity
- 14 ft
- Typical in September
- 69°F
- Max depth
- 27 ft
- Area
- 226 acres
- Type
- Mesotrophic
- Trend
- → Stable
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Watch Rennie Lake’s letter
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Rennie Lake is a 226-acre mesotrophic lake in Grand Traverse County, Michigan with a maximum depth of 27 feet. Water quality is graded A based on 2 sampling years through 2023. Water clarity is improving over recent sampling years. The lake supports 9 documented fish species including Bluegill, Bluntnose minnow, and Brown bullhead. Compared to the 4 other monitored lakes in Grand Traverse County, Rennie Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2023-09-10. Grade methodology: LakeQuality methodology.
What Rennie Lake is good for
From access and monitoring records, not editorial picks.
- Clear water14 ft of visibility
- Fishing9 species recorded
Swimming Safety
Grade onlyLow algae
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 14 ft. Phosphorus 8 µg/L. Chlorophyll-a 3.5 µg/L. TSI 39. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 14 ft | Not graded |
| Phosphorus | 8 µg/L | Good |
| Chlorophyll-a (Algae) | 3.5 µg/L | Good |
| Trophic State Index (TSI) | 39 | Mesotrophic |
Moderate nutrients, good water quality
Water Temperature
Rennie Lake typically sits around 69°F at the surface in September. Summer average is about 72°F. Usually warmest in Aug (about 75°F) and coldest in May (about 56°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 117 field readings (2021–2021) via the EPA Water Quality Portal. See the full Rennie Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 27 ft |
| Surface Area | 226 acres |
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Rennie Lake
Water Quality Trend: → Stable
Based on 8 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.213 m/yr | 8 |
| Phosphorus | → Stable | +0.16 µg/L/yr | 7 |
| Chlorophyll-a | ↓ Declining | +0.67 µg/L/yr | 4 |
County Ranking
Ranked #2 of 5 lakes in Grand Traverse County
Nearby Lakes in Grand Traverse County
Frequently asked questions about Rennie Lake
Where is Rennie Lake?
- Rennie Lake is a lake in Grand Traverse County, Michigan. LakeQuality grades it A for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Rennie Lake?
- Rennie Lake in Grand Traverse County, Michigan has a water quality grade of A (Excellent). Water clarity: 14 ft visibility. Phosphorus: 8 µg/L. Chlorophyll-a (algae): 3.5 µg/L. Maximum depth: 27 ft. Surface area: 225.8 acres.
Is Rennie 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 Rennie Lake?
- Rennie Lake typically sits around 69°F at the surface in September, from 117 EPA Water Quality Portal field readings (2021–2021). That is a typical value for the month, not a live reading.
How deep is Rennie Lake?
- Rennie Lake has a maximum depth of 27 feet. The lake covers 225.8 acres.
What fish are in Rennie Lake?
- Fish species found in Rennie Lake include Bluegill, Bluntnose minnow, Brown bullhead, Green sunfish, Iowa darter, Largemouth bass, Sand shiner, Western banded killifish, Yellow perch. Rennie Lake is located in Grand Traverse County, Michigan.
Explore Rennie Lake across LakeQuality
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Moderate nutrients, good water quality
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Planning a trip around Sleeping Bear Dunes?
Rennie Lake is about 33 miles from Sleeping Bear Dunes National Lakeshore. Crowds there swing hard by season, so the month you pick changes both how busy the park is and what lodging costs.
Best time to visit Sleeping Bear Dunes →More Michigan Lake Rankings
Other Grade A Lakes in Michigan
Mesotrophic Lakes in Michigan
Where this data comes from
152 measurements from 1 monitoring station, 2016–2023. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- Michigan EGLE - MiCorps
21MICH_MICORPS152 samples · 2016–2023
Analytical methods
- Phosphorus by Colorimetry
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
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.