Clark Lake
Livingston County, Michigan23 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 · PCBs
- 40 ft max depth
- Limited data
Clark Lake in Livingston County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 12 ft visibility. Maximum depth: 40 ft. Surface area: 23.2 acres.
- Clarity
- 12 ft
- Max depth
- 40 ft
- Area
- 23 acres
- Trend
- ↓ Declining
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Stays near Clark Lake
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Watch Clark Lake’s letter
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Why Clark Lake has no grade
Clark 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, Clark Lake is Not Rated — not an F. Its 12-foot median from 42 readings collected 2019–2022 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.
Clark Lake is a 23-acre lake in Livingston County, Michigan with a maximum depth of 40 feet. Overall water quality is declining over recent sampling years. The lake supports 20 documented fish species including Black bullhead, Blackchin shiner, and Blacknose shiner.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2022-09-08. Grade methodology: LakeQuality methodology.
What Clark Lake is good for
From access and monitoring records, not editorial picks.
- Clear water12 ft of visibility
- Fishing20 species recorded
- Deep water40 ft surveyed max depth
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Clark Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for pCBs. Check local advisories before you swim.
Water quality measurements for Clark Lake
These readings exist but are not enough for an A–F grade — see why.
Good clarity, visible to about 12 ft. TSI 41.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 12 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 41 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 40 ft |
| Surface Area | 23 acres |
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Clark Lake
Water Quality Trend: ↓ Declining
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | -0.015 m/yr | 4 |
| Phosphorus | ↓ Declining | +0.43 µg/L/yr | 3 |
EPA Impairment Status
Clark Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MI040900050111-03 · Official waterbody report · Matched by proximity (2.98 km)
Regulated Pollution Sources Nearby
3 EPA-permitted facilities operate within about 5 miles of Clark Lake under Clean Water Act (NPDES) discharge permits.
- Transtar Autobody TechnologiesBrighton · 1.1 mi away · NPDES MI0056988
- Plastech Eng Prod-HartlandHartland · 3.7 mi away · NPDES MIG250477
- Hartland Twp WwtpHartland · 4.9 mi away · NPDES MI0055841
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 Clark Lake
Clark Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Livingston County
Frequently asked questions about Clark Lake
Where is Clark Lake?
- Clark Lake is a lake in Livingston 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 Clark Lake?
- Clark Lake in Livingston County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 12 ft visibility. Maximum depth: 40 ft. Surface area: 23.2 acres.
Is Clark Lake safe to swim in?
- The letter is not a swimming clearance. Clark Lake is listed impaired under Clean Water Act §303(d) (IR 4A) for pCBs. Check local advisories before you swim.
How deep is Clark Lake?
- Clark Lake has a maximum depth of 40 feet. The lake covers 23.2 acres.
What fish are in Clark Lake?
- Fish species found in Clark Lake include Black bullhead, Blackchin shiner, Blacknose shiner, Bluegill, Bluntnose minnow, Brook silverside, Emerald shiner, Green sunfish, Lake herring, Largemouth bass, Longnose gar, Northern longear sunfish, Rock bass, Smallmouth bass, Spotfin shiner, Spottail shiner, Tadpole madtom, Western banded killifish, Yellow bullhead, Yellow perch. Clark Lake is located in Livingston County, Michigan.
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Where this data comes from
42 measurements from 1 monitoring station, 2019–2022. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- North American Lake Management Society
NALMS42 samples · 2019–2022
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)