August Lake
August Lake in Lake County, Minnesota has a water quality grade of A (Excellent). Water clarity: 4.7 ft visibility. Phosphorus: 13 µg/L. Chlorophyll-a (algae): 2 µg/L. Maximum depth: 19 ft. Surface area: 228.68 acres.
- Clarity
- 4.7 ft
- Typical in August
- 68°F
- Max depth
- 19 ft
- Area
- 229 acres
- Type
- Mesotrophic
- Public access
- Yes
Next lake in Lake County
August Lake is a 229-acre mesotrophic lake in Lake County, Minnesota with a maximum depth of 19 feet. Water quality is graded A based on 2 sampling years through 2025. The lake supports 7 documented fish species including burbot, largemouth bass, and northern pike. Public access is available. Compared to the 34 other monitored lakes in Lake County, August Lake ranks #21 for water quality.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2025-09-30. Grade methodology: LakeGrade methodology.
Watch August Lake water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Grade onlyLimited data
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)
Murky, only visible to about 4.7 ft. Phosphorus level: 13 µg/L. Chlorophyll-a: 2 µg/L. Trophic State Index: 44.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.7 ft | Not graded |
| Phosphorus | 13 µg/L | Good |
| Chlorophyll-a (Algae) | 2 µg/L | Good |
| Trophic State Index (TSI) | 44 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near August Lake
Compare lakeside cabins, hotels, and vacation rentals near August Lake in Lake County, Minnesota — 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 August Lake
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 Minnesota’s top lakes →
Water Temperature
August Lake typically sits around 68°F at the surface in August. Summer average is about 67°F. Usually warmest in Jul (about 68°F) and coldest in Sep (about 62°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 28 field readings (2011–2025) via the EPA Water Quality Portal. See the full August Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 19 ft |
| Surface Area | 229 acres |
| Shoreline Length | 6 mi |
| Littoral Zone | 96% |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Fish Species
Click a species to see every graded lake where it is documented.
Fishing August Lake
EPA Impairment Status
August Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit MN38-0691-00 · Official waterbody report
County Ranking
Ranked #21 of 35 lakes in Lake County
Nearby Lakes in Lake County
Frequently asked questions about August Lake
What is the water quality grade for August Lake?
- August Lake in Lake County, Minnesota has a water quality grade of A (Excellent). Water clarity: 4.7 ft visibility. Phosphorus: 13 µg/L. Chlorophyll-a (algae): 2 µg/L. Maximum depth: 19 ft. Surface area: 228.68 acres.
Is August Lake safe to swim in?
- Excellent for swimming, crystal clear water with minimal algae. August Lake 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 August Lake?
- August Lake typically sits around 68°F at the surface in August, from 28 EPA Water Quality Portal field readings (2011–2025). That is a typical value for the month, not a live reading.
How deep is August Lake?
- August Lake has a maximum depth of 19 feet. The lake covers 228.68 acres.
What fish are in August Lake?
- Fish species found in August Lake include burbot, largemouth bass, northern pike, rock bass, walleye, white sucker, yellow perch. August Lake is located in Lake County, Minnesota.
Explore August Lake across LakeGrade
Fish species and top-graded lakes across Minnesota
Fish species and best lakes in Lake County
Species activity outlook by water temperature and season
Where to stay at Minnesota's top lakes, each with its grade
Lakes in the Lake Superior Basin (MN+WI), ranked by water quality
Moderate nutrients, good water quality
Minnesota's cleanest and most-polluted lakes, ranked
More Minnesota Lake Rankings
State Parks Near August Lake
Other Grade A Lakes in Minnesota
Mesotrophic Lakes in Minnesota
Where this data comes from
14 measurements from 1 monitoring station, 2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA14 samples · 2025
Analytical methods
- Field measurement/observation, generic method
- Phosphorus by Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
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
Lake size & watershed from HydroLAKES (HydroSHEDS)
Lake details from Minnesota DNR LakeFinder