Round Lake Central Basin
Round Lake Central Basin in Lenawee County, Michigan has a water quality grade of A (Excellent). Water clarity: 12.3 ft visibility. Phosphorus: 8 µg/L. Chlorophyll-a (algae): 2 µg/L. Maximum depth: 67 ft. Surface area: 507.3 acres.
- Clarity
- 12.3 ft
- Typical in August
- 62°F
- Max depth
- 67 ft
- Area
- 507 acres
- Type
- Oligotrophic
- Trend
- ↓ Declining
Next lake in Lenawee County
Swipe left or right on this bar to open the next or previous lake.
Round Lake Central Basin is a 507-acre cold, clear oligotrophic lake in Lenawee County, Michigan with a maximum depth of 67 feet. Water quality is graded A based on 2 sampling years through 2023. Overall water quality is declining over recent sampling years. The lake supports 25 documented fish species including Blackchin shiner, Blacknose shiner, and Bluegill. Compared to the 4 other monitored lakes in Lenawee County, Round Lake Central Basin ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, EGLE, last sampled 2023-09-18. Grade methodology: LakeQuality methodology.
Watch Round Lake Central Basin water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
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.
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A (Excellent)
Good clarity, visible to about 12.3 ft. Phosphorus level: 8 µg/L. Chlorophyll-a: 2 µg/L. Trophic State Index: 38.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 12.3 ft | Not graded |
| Phosphorus | 8 µg/L | Good |
| Chlorophyll-a (Algae) | 2 µg/L | Good |
| Trophic State Index (TSI) | 38 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Round Lake Central Basin
Compare lakeside cabins, hotels, and vacation rentals near Round Lake Central Basin in Lenawee 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 Round Lake Central Basin
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Michigan’s top lakes →
Water Temperature
Round Lake Central Basin 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 Mar (about 42°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 1,397 field readings (2010–2023) via the EPA Water Quality Portal. See the full Round Lake Central Basin water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 67 ft |
| Surface Area | 507 acres |
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Round Lake Central Basin
Water Quality Trend: ↓ Declining
Based on 7 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.376 m/yr | 4 |
| Phosphorus | ↓ Declining | +0.4 µg/L/yr | 7 |
| Chlorophyll-a | ↓ Declining | +0.11 µg/L/yr | 7 |
EPA Impairment Status
Round Lake Central Basin 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 MI041000060101-02 · Official waterbody report · Matched by proximity (2.97 km)
County Ranking
Ranked #2 of 5 lakes in Lenawee County
Nearby Lakes in Lenawee County
Frequently asked questions about Round Lake Central Basin
Where is Round Lake Central Basin?
- Round Lake Central Basin is a lake in Lenawee County, Michigan. LakeQuality grades it A for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Round Lake Central Basin?
- Round Lake Central Basin in Lenawee County, Michigan has a water quality grade of A (Excellent). Water clarity: 12.3 ft visibility. Phosphorus: 8 µg/L. Chlorophyll-a (algae): 2 µg/L. Maximum depth: 67 ft. Surface area: 507.3 acres.
Is Round Lake Central Basin safe to swim in?
- Excellent for swimming, crystal clear water with minimal algae. Round Lake Central Basin has a water quality grade of A (Excellent). Algae concentration (chlorophyll-a) is 2 µg/L. Always check local health department advisories before swimming.
What is the water temperature of Round Lake Central Basin?
- Round Lake Central Basin typically sits around 62°F at the surface in August, from 1,397 EPA Water Quality Portal field readings (2010–2023). That is a typical value for the month, not a live reading.
How deep is Round Lake Central Basin?
- Round Lake Central Basin has a maximum depth of 67 feet. The lake covers 507.3 acres.
What fish are in Round Lake Central Basin?
- Fish species found in Round Lake Central Basin include Blackchin shiner, Blacknose shiner, Bluegill, Bluntnose minnow, Brook silverside, Brook stickleback, Creek chub, Golden shiner, Grass pickerel, Iowa darter, Johnny darter, Lake chubsucker, Largemouth bass, Longnose gar, Northern longear sunfish, Pumpkinseed, Rock bass, Smallmouth bass, Spotfin shiner, Spottail shiner, Tadpole madtom, Western banded killifish, White bass, Yellow bullhead, Yellow perch. Round Lake Central Basin is located in Lenawee County, Michigan.
Explore Round Lake Central Basin across LakeQuality
Fish species and top-graded lakes across Michigan
Fish species and best lakes in Lenawee County
Species activity outlook by water temperature and season
Top lakes and where to stay in the Irish Hills area
Where to stay at Michigan's top lakes, each with its grade
Low nutrients, clear water, excellent for swimming
Michigan's cleanest and most-polluted lakes, ranked
More Michigan Lake Rankings
Other Grade A Lakes in Michigan
Oligotrophic Lakes in Michigan
Where this data comes from
69 measurements from 1 monitoring station, 2016–2023. Retrieved from the EPA Water Quality Portal on 2026-08-26.
Collected and reported by
- Michigan EGLE - MiCorps
21MICH_MICORPS69 samples · 2016–2023
Analytical methods
- Phosphorus by Colorimetry
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
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