Hattie Lake
Hattie Lake in Hubbard County, Minnesota has a water quality grade of A (Excellent). Water clarity: 12.5 ft visibility. Phosphorus: 17.5 µg/L. Chlorophyll-a (algae): 6.2 µg/L. Maximum depth: 39 ft. Surface area: 359.38 acres.
- Clarity
- 12.5 ft
- Typical in August
- 70°F
- Max depth
- 39 ft
- Area
- 359 acres
- Type
- Mesotrophic
- Trend
- ↓ Declining
- Public access
- Yes
Next lake in Hubbard County
Hattie Lake is a 359-acre mesotrophic lake in Hubbard County, Minnesota with a maximum depth of 39 feet. Water quality is graded A based on 2 sampling years through 2025. Overall water quality is declining over recent sampling years. The lake supports 15 documented fish species including black bullhead, black crappie, and bluegill. Public access is available with 3 public boat landings. Compared to the 67 other monitored lakes in Hubbard County, Hattie Lake ranks #35 for water quality.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2025-09-16. Grade methodology: LakeGrade methodology.
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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 12.5 ft. Phosphorus level: 17.5 µg/L. Chlorophyll-a: 6.2 µg/L. Trophic State Index: 45.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 12.5 ft | Not graded |
| Phosphorus | 17.5 µg/L | Good |
| Chlorophyll-a (Algae) | 6.2 µg/L | Good |
| Trophic State Index (TSI) | 45 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Hattie Lake
Compare lakeside cabins, hotels, and vacation rentals near Hattie Lake in Hubbard 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.
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Water Temperature
Hattie Lake typically sits around 70°F at the surface in August. Summer average is about 68°F. Usually warmest in Jul (about 71°F) and coldest in May (about 59°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 92 field readings (2024–2025) via the EPA Water Quality Portal. See the full Hattie Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 39 ft |
| Surface Area | 359 acres |
| Shoreline Length | 4.7 mi |
| Littoral Zone | 21% |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Twenty LakePublic
- Hattie LakePublic
- Minnie LakePublic
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Hattie Lake
DNR Fisheries Survey Summary
8 surveys on file from MN DNR Fisheries. Most recent: 2023-07-31 (Standard Survey).
Top Species by Catch Rate
| Species | Avg CPUE | Avg Weight |
|---|---|---|
| Yellow Bass | 22.37 | 0.39 lb |
| Bluegill | 16.95 | 0.16 lb |
| Yellow Perch | 8.51 | 0.2 lb |
| CNM | 7.64 | — |
| Northern Pike | 4.51 | 1.36 lb |
| Pumpkinseed | 4.49 | 0.18 lb |
CPUE = catch per unit effort, averaged across surveys (excludes juvenile shoreline seining). Higher CPUE = more abundant in standardized sampling.
Length Distributions
Number of fish caught at each inch class in the most recent survey that recorded lengths. Red dashed line marks an approximate trophy threshold for that species.
Yellow Bass
Bluegill
Yellow Perch
Northern Pike
From the 2023-07-31 survey
Hattie Lake is located five miles northwest of the town of Lake George in northern Hubbard County. Hattie has a surface area of 359 acres and a maximum depth of 39 feet. There is a state-owned public access located on the east shore of the lake. Anglers will find good populations of Largemouth Bass, Bluegill, Northern…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Hattie Lake. 4 reports on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — HattieFisheries Lake Survey · MN DNR LakeFinder
- —Aquatic Plant Report — Hattie (1267)Aquatic Plant Report · MN DNR LakeFinder
- —Fish Stocking History — HattieFish Stocking History · MN DNR LakeFinder
- —Public Water Access Sites — HattiePublic Water Access Sites · MN DNR LakeFinder
Water Quality Trend: ↓ Declining
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.3 m/yr | 2 |
| Phosphorus | ↑ Improving | -1.5 µg/L/yr | 2 |
| Chlorophyll-a | ↓ Declining | +0.7 µg/L/yr | 2 |
County Ranking
Ranked #35 of 68 lakes in Hubbard County
Nearby Lakes in Hubbard County
Frequently asked questions about Hattie Lake
What is the water quality grade for Hattie Lake?
- Hattie Lake in Hubbard County, Minnesota has a water quality grade of A (Excellent). Water clarity: 12.5 ft visibility. Phosphorus: 17.5 µg/L. Chlorophyll-a (algae): 6.2 µg/L. Maximum depth: 39 ft. Surface area: 359.38 acres.
Is Hattie Lake safe to swim in?
- Excellent for swimming, crystal clear water with minimal algae. Hattie Lake has a water quality grade of A (Excellent). Algae concentration (chlorophyll-a) is 6.2 µg/L. Always check local health department advisories before swimming.
What is the water temperature of Hattie Lake?
- Hattie Lake typically sits around 70°F at the surface in August, from 92 EPA Water Quality Portal field readings (2024–2025). That is a typical value for the month, not a live reading.
How deep is Hattie Lake?
- Hattie Lake has a maximum depth of 39 feet. The lake covers 359.38 acres.
What fish are in Hattie Lake?
- Fish species found in Hattie Lake include black bullhead, black crappie, bluegill, brown bullhead, green sunfish, hybrid sunfish, largemouth bass, northern pike, northern pike (silver phase), pumpkinseed, rock bass, tullibee (cisco), walleye, yellow bullhead, yellow perch. Hattie Lake is located in Hubbard County, Minnesota.
Are there boat ramps on Hattie Lake?
- Hattie Lake has 3 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Twenty Lake, Hattie Lake, Minnie Lake. Public access is listed as yes.
Explore Hattie Lake across LakeGrade
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Where this data comes from
112 measurements from 1 monitoring station, 2024–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA112 samples · 2024–2025
Analytical methods
- Field measurement/observation, generic method
- Phosphorus by Two Reagent 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
Lake size & watershed from HydroLAKES (HydroSHEDS)
Lake details from Minnesota DNR LakeFinder
Named boat-access points from the USGS National Boat Ramps inventory