Sargent Lake
Keweenaw County, Michigan354 acresView mapDirections
Clarity, phosphorus, and algae sit in the clean band for this region.
↓ down from A at the last regrade
- Mesotrophic
- #3 of 11 in the county
- 46 ft max depth
Sargent Lake in Keweenaw County, Michigan has a water quality grade of B (Good). Water clarity: 10.5 ft visibility. Phosphorus: 13.2 µg/L. Surface area: 353.8 acres.
- Clarity
- 10.5 ft
- Typical in August
- 62°F
- Max depth
- ~46 ft est.
- Area
- 354 acres
- Type
- Mesotrophic
- Phosphorus
- 13.2 µg/L
- Trend
- ↓ Declining
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Watch Sargent Lake’s letter
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Sargent Lake is a 354-acre mesotrophic lake in Keweenaw County, Michigan with an estimated average depth of about 46 feet. Water quality is graded B based on 1 sampling years through 2024. Overall water quality is declining over recent sampling years. The lake supports 1 documented fish species including Blackchin shiner. Compared to the 10 other monitored lakes in Keweenaw County, Sargent Lake ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2024-08-28. Grade methodology: LakeQuality methodology.
What Sargent Lake is good for
From access and monitoring records, not editorial picks.
- Clear water10.5 ft of visibility
- Camping3 public campgrounds nearby
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 B is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: B (Good)
Good clarity, visible to about 10.5 ft. Phosphorus 13.2 µg/L. TSI 42. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 10.5 ft | Not graded |
| Phosphorus | 13.2 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 42 | Mesotrophic |
Moderate nutrients, good water quality
Water Temperature
Sargent Lake typically sits around 62°F at the surface in August. Summer average is about 61°F. Usually warmest in Jul (about 62°F) and coldest in May (about 47°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 928 field readings (2010–2024) via the EPA Water Quality Portal. See the full Sargent Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~46 ft est. |
| Average Depth | ~21 ft est. |
| Surface Area | 354 acres |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Michigan has not published bathymetry for Sargent Lake.
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Recreation & Access
Public campgrounds near Sargent Lake
- Birch Island2.7 km
- Pickerel Cove3.7 km
- Daisy Farm5.0 km
Nearest public campgrounds in the USGS National Map inventory, within about 3 miles. An empty list means USGS records no campground that close, which is not the same as camping being unavailable. Where the source gives an official reservation link, it is used; the cabin and hotel search does not cover campsites. More camping lakes
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Sargent Lake
Water Quality Trend: ↓ Declining
Based on 9 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.071 m/yr | 9 |
| Phosphorus | ↓ Declining | +1.3 µg/L/yr | 9 |
County Ranking
Ranked #3 of 11 lakes in Keweenaw County
Nearby Lakes in Keweenaw County
Frequently asked questions about Sargent Lake
Where is Sargent Lake?
- Sargent Lake is a lake in Keweenaw County, Michigan. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Sargent Lake?
- Sargent Lake in Keweenaw County, Michigan has a water quality grade of B (Good). Water clarity: 10.5 ft visibility. Phosphorus: 13.2 µg/L. Surface area: 353.8 acres.
Is Sargent Lake safe to swim in?
- The B is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
What is the water temperature of Sargent Lake?
- Sargent Lake typically sits around 62°F at the surface in August, from 928 EPA Water Quality Portal field readings (2010–2024). That is a typical value for the month, not a live reading.
How deep is Sargent Lake?
- No published bathymetric survey covers Sargent Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 46 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate. The lake covers 353.8 acres.
What fish are in Sargent Lake?
- Fish species found in Sargent Lake include Blackchin shiner. Sargent Lake is located in Keweenaw County, Michigan.
Are there campgrounds on Sargent Lake?
- Sargent Lake has 3 public campgrounds from USGS The National Map within 5 km, including Birch Island, Pickerel Cove, Daisy Farm. This is a location join, not a booking. Cabins and hotels are listed separately; campsite reservations use the official link when the source provides one.
Explore Sargent Lake across LakeQuality
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Moderate nutrients, good water quality
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Where this data comes from
59 measurements from 1 monitoring station, 2016–2024. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- National Park Service Water Resources Division
11NPSWRD_WQX59 samples · 2016–2024
Analytical methods
- Secchi Disk
- Alkaline Persulfate Digestion for Total N and P in Water
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
Lake size & watershed from HydroLAKES (HydroSHEDS)
Public campgrounds from USGS The National Map Structures, within about 3 miles