Crystal Lake
Benzie County, Michigan9,865 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.
- Impaired · Dioxins
- 175 ft max depth
- Public access
- Limited data
Crystal Lake in Benzie County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 32 ft visibility. Maximum depth: 175 ft. Surface area: 9864.7 acres.
- Clarity
- 32 ft
- Max depth
- 175 ft
- Area
- 9,865 acres
- Trend
- ↑ Improving
- Public access
- Yes
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Watch Crystal Lake’s letter
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Free interactive depth-contour map of Crystal Lake, reaching a maximum surveyed depth of 175 ft. Toggle Depth contours to overlay the bathymetric survey lines. Contour data from Michigan DNR.
Why Crystal Lake has no grade
Crystal 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, Crystal Lake is Not Rated — not an F. Its 32-foot median from 35 readings collected 2016–2022 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.
Crystal Lake is a 9,865-acre lake in Benzie County, Michigan with a maximum depth of 175 feet. Overall water quality is improving over recent sampling years. The lake supports 9 documented fish species including Black crappie, Burbot, and Johnny darter. Public access is available.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2022-09-08. Grade methodology: LakeQuality methodology.
What Crystal Lake is good for
From access and monitoring records, not editorial picks.
- Clear water32 ft of visibility
- Fishing9 species recorded
- Deep water175 ft surveyed max depth
- Big water9,865 acres
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Crystal Lake is listed impaired under Clean Water Act §303(d) (IR 5) for dioxins, mercury, pesticides, pCBs. Check local advisories before you swim.
Water quality measurements for Crystal Lake
These readings exist but are not enough for an A–F grade — see why.
Crystal clear, you can see 32 ft down. TSI 27.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 32 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 27 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 175 ft |
| Surface Area | 9,865 acres |
| Public Access | Yes |
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Crystal Lake
Invasive & Introduced Species
Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.
Source: USGS Nonindigenous Aquatic Species (NAS) Database. Hover a chip to see scientific name, ecological context, status, and first-observed year.
Water Quality Trend: ↑ Improving
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +1.483 m/yr | 7 |
| Phosphorus | → Stable | -0.08 µg/L/yr | 7 |
| Chlorophyll-a | → Stable | 0 µg/L/yr | 7 |
EPA Impairment Status
Crystal Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MI040601040305-03 · Official waterbody report
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Crystal Lake under Clean Water Act (NPDES) discharge permits.
- Village Of BeulahBeulah · 4 mi away · NPDES MIG960001
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.
Graded lakes near Crystal Lake
Crystal Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Benzie County
Frequently asked questions about Crystal Lake
Where is Crystal Lake?
- Crystal Lake is a lake in Benzie 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 Crystal Lake?
- Crystal Lake in Benzie County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 32 ft visibility. Maximum depth: 175 ft. Surface area: 9864.7 acres.
Is Crystal Lake safe to swim in?
- The letter is not a swimming clearance. Crystal Lake is listed impaired under Clean Water Act §303(d) (IR 5) for dioxins, mercury, pesticides, pCBs. Check local advisories before you swim.
How deep is Crystal Lake?
- Crystal Lake has a maximum depth of 175 feet. The lake covers 9864.7 acres.
What fish are in Crystal Lake?
- Fish species found in Crystal Lake include Black crappie, Burbot, Johnny darter, Lake herring, Lake whitefish, Mottled sculpin, Rainbow smelt, White sucker, Yellow perch. Crystal Lake is located in Benzie County, Michigan.
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Where this data comes from
35 measurements from 1 monitoring station, 2016–2022. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- North American Lake Management Society
NALMS35 samples · 2016–2022
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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Regulated discharger data from EPA ECHO (ICIS-NPDES)