Weaver Lake
Weaver Lake in Hennepin County, Minnesota has a water quality grade of D (Nutrient-rich). Water clarity: 5 ft visibility. Phosphorus: 38.7 µg/L. Chlorophyll-a (algae): 10.6 µg/L. Maximum depth: 57 ft. Surface area: 152.09 acres.
- Clarity
- 5 ft
- Typical in August
- 55°F
- Max depth
- 57 ft
- Area
- 152 acres
- Type
- Eutrophic
- Trend
- ↓ Declining
- Public access
- Yes
- Ice-out
- Mar 28
Grade D measures nutrients and algae, not whether this is a good place for a cabin trip. Cabins and rentals near Weaver Lake →
Next lake in Hennepin County
Weaver Lake is a 152-acre productive, nutrient-rich eutrophic lake in Hennepin County, Minnesota with a maximum depth of 57 feet (21-foot average). Water quality is graded D based on 3 sampling years through 2024. 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 1 public boat landing. Compared to the 80 other monitored lakes in Hennepin County, Weaver Lake ranks #44 for water quality.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2024-10-07. Grade methodology: LakeGrade methodology.
Watch Weaver Lake water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Grade onlyElevated nutrients
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.
Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum
Water Quality Grade: D (Nutrient-rich)
Murky, only visible to about 5 ft. Phosphorus level: 38.7 µg/L. Chlorophyll-a: 10.6 µg/L. Trophic State Index: 55.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5 ft | Not graded |
| Phosphorus | 38.7 µg/L | Fair |
| Chlorophyll-a (Algae) | 10.6 µg/L | Fair |
| Trophic State Index (TSI) | 55 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Weaver Lake
Compare lakeside cabins, hotels, and vacation rentals near Weaver Lake in Hennepin 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. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Weaver Lake are listed below.
Top-rated places to stay near Weaver 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
Weaver Lake typically sits around 55°F at the surface in August. Summer average is about 54°F. Usually warmest in Aug (about 55°F) and coldest in Jan (about 35°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 2,033 field readings (2010–2024) via the EPA Water Quality Portal. See the full Weaver Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 57 ft |
| Average Depth | 20.7 ft |
| Surface Area | 152 acres |
| Shoreline Length | 2.5 mi |
| Littoral Zone | 50% |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Weaver Lake ParkPublic
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Weaver Lake
Invasive & Introduced Species
Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.
DNR Fisheries Survey Summary
9 surveys on file from MN DNR Fisheries. Most recent: 2023-07-11 (Standard Survey).
Top Species by Catch Rate
| Species | Avg CPUE | Avg Weight |
|---|---|---|
| Bluegill | 80.32 | 0.15 lb |
| BCS | 28.74 | — |
| BNS | 26.29 | — |
| SFS | 15.51 | — |
| Yellow Bass | 9.37 | 0.91 lb |
| Largemouth Bass | 9.06 | 1.09 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.
Bluegill
Yellow Bass
Largemouth Bass
From the 2023-07-11 survey
Weaver Lake is a 152-acre lake with an average depth of 20.7 feet and a maximum depth of 57 feet. The lake is in the city of Maple Grove in north-central Hennepin County. Weaver is actively managed for Bluegill, with secondary emphasis on Northern Pike and Largemouth Bass. Weaver also supports catchable populations of…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Weaver Lake. 3 reports on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — WeaverFisheries Lake Survey · MN DNR LakeFinder
- —Fish Stocking History — WeaverFish Stocking History · MN DNR LakeFinder
- —Public Water Access Sites — WeaverPublic Water Access Sites · MN DNR LakeFinder
Water Quality Trend: ↓ Declining
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.042 m/yr | 6 |
| Phosphorus | ↓ Declining | +2.74 µg/L/yr | 4 |
| Chlorophyll-a | ↓ Declining | +0.47 µg/L/yr | 4 |
Ice Season
Historical ice data from Minnesota DNR (6 observations).
| Earliest | Latest | |
|---|---|---|
| Ice-Out | 2016-03-15 (2016) | 2022-04-14 (2022) |
| Ice-In | 2007-11-27 (2007) | 2011-11-29 (2011) |
Most recent ice-out: 2022-04-14
EPA Impairment Status
Weaver Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MN27-0117-00 · Official waterbody report
Regulated Pollution Sources Nearby
1 EPA-permitted facility operate within about 5 miles of Weaver Lake under Clean Water Act (NPDES) discharge permits.
- Maple Hill Estates WwtfCorcoran · 1.7 mi away · NPDES MN0031127
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
County Ranking
Ranked #44 of 81 lakes in Hennepin County
Nearby Lakes With Higher Grades
Weaver Lake holds Grade D. 2 nearby lakes hold higher nutrient-and-algae grades — useful for a swim day, not a reason to skip lodging here.
See full comparison →Nearby Lakes in Hennepin County
Frequently asked questions about Weaver Lake
What is the water quality grade for Weaver Lake?
- Weaver Lake in Hennepin County, Minnesota has a water quality grade of D (Nutrient-rich). Water clarity: 5 ft visibility. Phosphorus: 38.7 µg/L. Chlorophyll-a (algae): 10.6 µg/L. Maximum depth: 57 ft. Surface area: 152.09 acres.
Is Weaver Lake safe to swim in?
- Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum. Weaver Lake has a water quality grade of D (Nutrient-rich). Algae concentration (chlorophyll-a) is 10.6 µg/L. Always check local health department advisories before swimming.
What is the water temperature of Weaver Lake?
- Weaver Lake typically sits around 55°F at the surface in August, from 2,033 EPA Water Quality Portal field readings (2010–2024). That is a typical value for the month, not a live reading.
How deep is Weaver Lake?
- Weaver Lake has a maximum depth of 57 feet and an average depth of 20.7 feet. The lake covers 152.09 acres.
What fish are in Weaver Lake?
- Fish species found in Weaver Lake include black bullhead, black crappie, bluegill, bowfin (dogfish), brown bullhead, green sunfish, hybrid sunfish, largemouth bass, northern pike, pumpkinseed, tiger muskellunge, walleye, white sucker, yellow bullhead, yellow perch. Weaver Lake is located in Hennepin County, Minnesota.
When does Weaver Lake thaw?
- Weaver Lake typically has ice-out around Mar 28.
Are there boat ramps on Weaver Lake?
- Weaver Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Weaver Lake Park. Public access is listed as yes.
Explore Weaver Lake across LakeGrade
Fish species and top-graded lakes across Minnesota
Fish species and best lakes in Hennepin County
Species activity outlook by water temperature and season
Where to stay at Minnesota's top lakes, each with its grade
Lakes in the Crow River Watershed, ranked by water quality
High nutrients, frequent algae, reduced clarity
Minnesota's cleanest and most-polluted lakes, ranked
More Minnesota Lake Rankings
State Parks Near Weaver Lake
Other Grade D Lakes in Minnesota
Eutrophic Lakes in Minnesota
Where this data comes from
325 measurements from 1 monitoring station, 2020–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA325 samples · 2020–2024
Analytical methods
- Field measurement/observation, generic method
- Phosphorus by Two Reagent Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
- 4500 N C ~ Persufate Method for Total Nitrogen
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
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Lake details from Minnesota DNR LakeFinder
Named boat-access points from the USGS National Boat Ramps inventory
Ice data from Minnesota DNR Climate