East Twin Lake
Montmorency County, Michigan820 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.
- 25 ft max depth
- Public access
- Limited data
East Twin Lake in Montmorency County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 8 ft visibility. Maximum depth: 25 ft. Surface area: 820.4 acres.
- Clarity
- 8 ft
- Max depth
- 25 ft
- Area
- 820 acres
- Trend
- ↓ Declining
- Public access
- Yes
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Watch East Twin Lake’s letter
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Free interactive depth-contour map of East Twin Lake, reaching a maximum surveyed depth of 25 ft. Toggle Depth contours to overlay the bathymetric survey lines. Contour data from Michigan DNR.
Why East Twin Lake has no grade
East Twin 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, East Twin Lake is Not Rated — not an F. Its 8-foot median from 128 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.
East Twin Lake is a 820-acre lake in Montmorency County, Michigan with a maximum depth of 25 feet. Overall water quality is declining over recent sampling years. The lake supports 7 documented fish species including Johnny darter, Largemouth bass, and Mimic shiner. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2022-09-07. Grade methodology: LakeQuality methodology.
What East Twin Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
- Fishing7 species recorded
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for East Twin Lake
These readings exist but are not enough for an A–F grade — see why.
Moderate clarity, visible to about 8 ft. TSI 47.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 8 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 47 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 25 ft |
| Surface Area | 820 acres |
| Public Access | Yes |
Recreation & Access
- East Twin LakePublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fish Species
Click a species to see every graded lake where it is documented.
Fishing East Twin Lake
Water Quality Trend: ↓ Declining
Based on 8 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.743 m/yr | 8 |
| Phosphorus | ↓ Declining | +0.85 µg/L/yr | 7 |
| Chlorophyll-a | ↓ Declining | +0.14 µg/L/yr | 7 |
Graded lakes near East Twin Lake
East Twin Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Montmorency County
Frequently asked questions about East Twin Lake
Where is East Twin Lake?
- East Twin Lake is a lake in Montmorency 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 East Twin Lake?
- East Twin Lake in Montmorency County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 8 ft visibility. Maximum depth: 25 ft. Surface area: 820.4 acres.
Is East Twin Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
How deep is East Twin Lake?
- East Twin Lake has a maximum depth of 25 feet. The lake covers 820.4 acres.
What fish are in East Twin Lake?
- Fish species found in East Twin Lake include Johnny darter, Largemouth bass, Mimic shiner, Smallmouth bass, Spottail shiner, White sucker, Yellow perch. East Twin Lake is located in Montmorency County, Michigan.
Are there boat ramps on East Twin Lake?
- East Twin Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include East Twin Lake. Public access is listed as yes.
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Where this data comes from
128 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
NALMS128 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
Named boat-access points from the USGS National Boat Ramps inventory