---
type: lake
name: "Blackwater Lake"
county: "Cass"
nearest_town: "Longville"
lake_type: "lake"
acres: 771
max_depth_ft: 67
latitude: 46.90925
longitude: -94.30433
lake_score: 66
dnr_lake_id: "11027400"
url: https://www.minnelakes.org/lakes/cass-county/blackwater-lake
---

# Blackwater Lake

Lake in Cass County, Minnesota, near Longville

- **Surface Area**: 771 acres
- **Max Depth**: 67 ft
- **Shoreline**: 7.7 miles
- **Water Clarity**: 12.5 ft
- **Lake Type**: lake
- **Public Access**: 1 public boat launch (concrete)
- **Lake Score**: 66/100 (composite of public data, not a visitor rating)

## About

Blackwater Lake is a 771-acre lake near Longville in Cass County, Minnesota. It reaches 67 feet at its deepest point, and has roughly 7.7 miles of shoreline. DNR surveys put average water clarity at about 12.5 feet, clearer than most lakes in the state.

Minnesota DNR fisheries surveys list 16 fish species here, including walleye, northern pike, largemouth bass, smallmouth bass, black crappie, and bluegill. The DNR has stocking records for the lake, so check the stocking report for the most recent species and year classes. The most recent fisheries survey on file dates to 2023.

There is one public boat launch (concrete surface) managed by the Minnesota DNR. Ice typically goes out around April 17, based on 22 years of DNR ice-out records.

## Access

- **Public access**: 1 public boat launch (concrete)
- **Managed by**: Minnesota DNR
- **Launch fee**: Free at DNR public water accesses

## Fishing

- **Species on DNR survey**: 16
- **Stocked**: Yes
- **Last DNR survey**: 2023
- **Special regulations**: No
- **Ice fishing**: Yes

## Activities

Fishing, Ice Fishing, Boating, Paddling

## Amenities

Boat Ramp

## Fish Species

Walleye, Northern Pike, Largemouth Bass, Smallmouth Bass, Black Crappie, Bluegill, Pumpkinseed, Yellow Perch, Tullibee (Cisco), Rock Bass, Black Bullhead, Bowfin, Brown Bullhead, Hybrid Sunfish, White Sucker, Yellow Bullhead

## Ice-Out

- **Median ice-out**: April 17
- **Years of record**: 22
- **Earliest**: 2012-03-25
- **Latest**: 2013-05-13

## Nearby Lakes

- [Widow Lake](https://www.minnelakes.org/lakes/cass-county/widow-lake) - 1.5 miles, 198 acres
- [Island Lake](https://www.minnelakes.org/lakes/cass-county/island-lake-longville) - 1.6 miles, 184 acres
- [Sand Lake](https://www.minnelakes.org/lakes/cass-county/sand-lake-longville) - 1.7 miles, 41 acres
- [Sand Lake](https://www.minnelakes.org/lakes/cass-county/sand-lake) - 1.7 miles, 149 acres
- [Mule Lake](https://www.minnelakes.org/lakes/cass-county/mule-lake) - 1.9 miles, 525 acres
- [Long Lake](https://www.minnelakes.org/lakes/cass-county/long-lake-hackensack) - 2.8 miles, 246 acres

## Links

- [Directions](https://www.google.com/maps/dir/?api=1&destination=46.90925,-94.30433)
- [Minnesota DNR LakeFinder](https://www.dnr.state.mn.us/lakefind/lake.html?id=11027400)
- [All lakes in Cass County](https://www.minnelakes.org/lakes/cass-county)

---
*Source: [MinneLakes.org](https://www.minnelakes.org/lakes/cass-county/blackwater-lake)*