Rush Lake
Rush Lake in Sherburne County, Minnesota has a water quality grade of F (Algae-prone). Water clarity: 2 ft visibility. Phosphorus: 113 µg/L. Chlorophyll-a (algae): 42.1 µg/L. Maximum depth: 11 ft. Surface area: 160.91 acres.
- Clarity
- 2 ft
- Typical in August
- 74°F
- Max depth
- 11 ft
- Area
- 161 acres
- Type
- Eutrophic
- Trend
- ↓ Declining
- Public access
- Yes
- Ice-out
- Apr 1
- Open water
- 251 days
Grade F measures nutrients and algae, not whether this is a good place for a cabin trip. Cabins and rentals near Rush Lake →
Next lake in Sherburne County
Rush Lake is a 161-acre productive, nutrient-rich eutrophic lake in Sherburne County, Minnesota with a maximum depth of 11 feet (7-foot average). Water quality is graded F based on 2 sampling years through 2023. Overall water quality is declining over recent sampling years. The lake supports 18 documented fish species including black bullhead, black crappie, and bluegill. Public access is available with 2 public boat landings. Compared to the 17 other monitored lakes in Sherburne County, Rush Lake ranks #17 for water quality.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2023-09-26. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyAlgae risk
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.
Algae and nutrients are often high — check current advisories before swimming. Skip the water if you see scum or a paint-like bloom
Water Quality Grade: F (Algae-prone)
Very murky, less than 2 ft of visibility. Phosphorus level: 113 µg/L. Chlorophyll-a: 42.1 µg/L. Trophic State Index: 69.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2 ft | Not graded |
| Phosphorus | 113 µg/L | Poor |
| Chlorophyll-a (Algae) | 42.1 µg/L | Poor |
| Trophic State Index (TSI) | 69 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Rush Lake
Compare lakeside cabins, hotels, and vacation rentals near Rush Lake in Sherburne 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 Rush Lake are listed below.
Top-rated places to stay near Rush 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
Rush Lake typically sits around 74°F at the surface in August. Summer average is about 74°F. Usually warmest in Jun (about 75°F) and coldest in May (about 66°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 199 field readings (2023–2023) via the EPA Water Quality Portal. See the full Rush Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 11 ft |
| Average Depth | 6.7 ft |
| Surface Area | 161 acres |
| Shoreline Length | 2.7 mi |
| Littoral Zone | 100% |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Briggs LakePublic
- Rush LakePublic
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Rush 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
18 surveys on file from MN DNR Fisheries. Most recent: 2024-10-03 (Targeted Survey).
Top Species by Catch Rate
| Species | Avg CPUE | Avg Weight |
|---|---|---|
| White Crappie | 40.11 | 0.33 lb |
| Black Crappie | 40.08 | 0.21 lb |
| Walleye | 36.96 | 1.55 lb |
| JND | 26.22 | — |
| Yellow Perch | 19.29 | 0.11 lb |
| Largemouth Bass | 18.34 | 1.59 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.
White Crappie
Black Crappie
Walleye
Yellow Perch
From the 2024-10-03 survey
The Briggs Chain of Lakes is made up of Briggs, Julia and Rush lakes which are connected by a navigable channel. Walleye fry have been stocked into the chain every other year since 1992. Night electrofishing was conducted during the evening of October 3, 2024. A total of nine young of year (YOY) Walleye were collected…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Rush Lake. 4 reports on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — RushFisheries Lake Survey · MN DNR LakeFinder
- —Aquatic Plant Report — Rush (1973)Aquatic Plant Report · MN DNR LakeFinder
- —Fish Stocking History — RushFish Stocking History · MN DNR LakeFinder
- —Public Water Access Sites — RushPublic Water Access Sites · MN DNR LakeFinder
Water Quality Trend: ↓ Declining
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.043 m/yr | 5 |
| Phosphorus | ↓ Declining | +16.33 µg/L/yr | 2 |
| Chlorophyll-a | ↓ Declining | +6.77 µg/L/yr | 2 |
Ice Season
Historical ice data from Minnesota DNR (22 observations).
Estimated open water season: 251 days
| Earliest | Latest | |
|---|---|---|
| Ice-Out | 2024-03-03 (2024) | 2013-04-29 (2013) |
| Ice-In | 2007-11-01 (2007) | 2015-12-20 (2015) |
Most recent ice-out: 2026-03-30
EPA Impairment Status
Rush 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 MN71-0147-00 · Official waterbody report
County Ranking
Ranked #17 of 18 lakes in Sherburne County
Nearby Lakes With Higher Grades
Rush Lake holds Grade F. 3 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 Sherburne County
Frequently asked questions about Rush Lake
What is the water quality grade for Rush Lake?
- Rush Lake in Sherburne County, Minnesota has a water quality grade of F (Algae-prone). Water clarity: 2 ft visibility. Phosphorus: 113 µg/L. Chlorophyll-a (algae): 42.1 µg/L. Maximum depth: 11 ft. Surface area: 160.91 acres.
Is Rush Lake safe to swim in?
- Algae and nutrients are often high — check current advisories before swimming. Skip the water if you see scum or a paint-like bloom. Rush Lake has a water quality grade of F (Algae-prone). Algae concentration (chlorophyll-a) is 42.1 µg/L. Always check local health department advisories before swimming.
What is the water temperature of Rush Lake?
- Rush Lake typically sits around 74°F at the surface in August, from 199 EPA Water Quality Portal field readings (2023–2023). That is a typical value for the month, not a live reading.
How deep is Rush Lake?
- Rush Lake has a maximum depth of 11 feet and an average depth of 6.7 feet. The lake covers 160.91 acres.
What fish are in Rush Lake?
- Fish species found in Rush Lake include black bullhead, black crappie, bluegill, bowfin (dogfish), brown bullhead, common carp, green sunfish, hybrid sunfish, largemouth bass, northern pike, pumpkinseed, shorthead redhorse, smallmouth bass, walleye, white crappie, white sucker, yellow bullhead, yellow perch. Rush Lake is located in Sherburne County, Minnesota.
When does Rush Lake thaw?
- Rush Lake typically has ice-out around Apr 1. Ice typically forms around Dec 8. The open water season is approximately 251 days.
Are there boat ramps on Rush Lake?
- Rush Lake has 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Briggs Lake, Rush Lake. Public access is listed as yes.
Explore Rush Lake across LakeGrade
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Species activity outlook by water temperature and season
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High nutrients, frequent algae, reduced clarity
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Where this data comes from
74 measurements from 1 monitoring station, 2020–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA74 samples · 2020–2023
Analytical methods
- Field measurement/observation, generic method
- 4500 P E ~ Phosphorus in Water by Colorimetry- Ascorbic Acid 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
Named boat-access points from the USGS National Boat Ramps inventory
Ice data from Minnesota DNR Climate