Lake Margrethe
Lake Margrethe in Crawford County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 16 ft visibility. Maximum depth: 65 ft. Surface area: 1919.7 acres.
- Clarity
- 16 ft
- Max depth
- 65 ft
- Area
- 1,920 acres
- Trend
- → Stable
- Public access
- Yes
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Why Lake Margrethe has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Lake Margrethe, 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. Sampling here has recorded water clarity, but not phosphorus and algae (chlorophyll-a).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. 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.
Lake Margrethe is a 1,920-acre lake in Crawford County, Michigan with a maximum depth of 65 feet. Water clarity is improving over recent sampling years. The lake supports 21 documented fish species including Bluegill, Bluntnose minnow, and Brown bullhead. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2021-09-17. Grade methodology: LakeQuality methodology.
Watch Lake Margrethe water quality
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Lake Margrethe
These readings exist but are not enough for an A–F grade — see why.
Crystal clear, you can see 16 ft down. Trophic State Index: 37.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 16 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 37 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Lake Margrethe
Compare lakeside cabins, hotels, and vacation rentals near Lake Margrethe in Crawford County, Michigan — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Lake Margrethe
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Planning a trip? Cabins and lodging at Lake Margrethe → · more Michigan lake trips
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 65 ft |
| Surface Area | 1,920 acres |
| Public Access | Yes |
Recreation & Access
- Lake Margrethe (West)Public
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 Lake Margrethe
Water Quality Trend: → Stable
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.982 m/yr | 6 |
| Phosphorus | ↓ Declining | +0.35 µg/L/yr | 5 |
| Chlorophyll-a | → Stable | 0 µg/L/yr | 3 |
EPA Impairment Status
Lake Margrethe 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 MI040601030104-04 · Official waterbody report
Graded lakes near Lake Margrethe
Lake Margrethe has no grade, but these lakes within a short drive do.
Nearby Lakes in Crawford County
Frequently asked questions about Lake Margrethe
Where is Lake Margrethe?
- Lake Margrethe is a lake in Crawford County, Michigan. LakeQuality has not rated this lake (UNRATED) — there is not enough recent sampling to assign a letter.
What is the water quality grade for Lake Margrethe?
- Lake Margrethe in Crawford County, Michigan is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 16 ft visibility. Maximum depth: 65 ft. Surface area: 1919.7 acres.
Is Lake Margrethe safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Lake Margrethe is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
How deep is Lake Margrethe?
- Lake Margrethe has a maximum depth of 65 feet. The lake covers 1919.7 acres.
What fish are in Lake Margrethe?
- Fish species found in Lake Margrethe include Bluegill, Bluntnose minnow, Brown bullhead, Central mudminnow, Common shiner, Creek chub, Johnny darter, Largemouth bass, Mimic shiner, Northern logperch, Northern longear sunfish, Northern pike, Northern redbelly dace, Pumpkinseed, Rock bass, Sand shiner, Smallmouth bass, Spottail shiner, Walleye, White sucker, Yellow perch. Lake Margrethe is located in Crawford County, Michigan.
Are there boat ramps on Lake Margrethe?
- Lake Margrethe has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Lake Margrethe (West). Public access is listed as yes.
Explore Lake Margrethe across LakeQuality
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Where this data comes from
51 measurements from 1 monitoring station, 2016–2021. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- North American Lake Management Society
NALMS51 samples · 2016–2021
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
Named boat-access points from the USGS National Boat Ramps inventory