Mule Lake
Cass County, Minnesota, near Longville. DNR lake ID 11020000.
Mule Lake is a 524.6-acre lake in Cass County, Minnesota, near Longville. Its deepest point reaches 47 ft, and about 35% of the lake is shallower than 15 feet. Summer water clarity averages 18.1 feet in Minnesota Pollution Control Agency monitoring, which places it in the oligotrophic nutrient class. It is not on the DNR infested waters list as of September 2026. DNR surveys document walleye, northern pike, largemouth bass, smallmouth bass, black crappie, bluegill.
Buying or selling on Mule Lake? Ask us what lakeshore here actually sells for, which stretches of shoreline buyers compete for, and what’s coming up before it’s listed.
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Quick facts
| DNR lake ID | 11020000 |
|---|---|
| County | Cass County, near Longville |
| Surface area | 524.6 acres |
| Maximum depth | 47 ft |
| Share under 15 ft | 35% |
| Water clarity (summer) | 18.1 ft through 2025 |
| Phosphorus (summer) | 11.6 µg/L |
| Algae, chlorophyll-a (summer) | 3.3 µg/L |
| Nutrient class | Oligotrophic |
| Clarity trend | Steady (2016 to 2025) |
| Invasive species | Not on DNR infested waters list (Sept 2026) |
| Public water accesses | 2 |
Water quality
Summer averages from Minnesota Pollution Control Agency monitoring through 2025: clarity 18.1 ft, phosphorus 11.6 µg/L, algae (chlorophyll-a) 3.3 µg/L. Using the Carlson trophic state index, Mule Lake rates as oligotrophic. Summer clarity trend 2016 to 2025: steady.
Fishing on Mule Lake
The most recent DNR standard fish survey was in 2022 (4 years ago). Catch per net is compared with the DNR’s typical range for lakes of the same type.
| Species | Net | Catch per net | Typical range |
|---|---|---|---|
| Walleye | trap | 0.11 | 0.2 to 0.7 |
| Northern pike | trap | 1.11 | n/a |
| Yellow perch | trap | 0.33 | 0.4 to 2.3 |
| Black crappie | trap | 1.22 | 0.5 to 2.2 |
| Bluegill | trap | 27.33 | 7.7 to 43.4 |
| Largemouth bass | trap | 0.56 | 0.4 to 1.5 |
| Pumpkinseed | trap | 2.78 | 1.4 to 5.9 |
| Rock bass | trap | 1.78 | 0.8 to 3.7 |
| Hybrid sunfish | trap | 0.11 | n/a |
Largest fish measured in recent DNR samples: Largemouth bass 13.0 in (2022), Walleye 22.0 in (2022), Smallmouth bass 14.0 in (2018), Northern pike 20.0 in (2022).
Game and panfish documented since 2005: Walleye, Northern pike, Largemouth bass, Smallmouth bass, Black crappie, Bluegill, Yellow perch, Pumpkinseed, Hybrid sunfish, Rock bass, Tullibee (cisco), White sucker, Brown bullhead.
Fishing regulations
No lake-specific regulation found in Minnesota Rules or the DNR sunfish list. Statewide and zone regulations apply.
Regulations change. Confirm with the DNR before fishing.
Invasive species
Not on the Minnesota DNR infested waters list as of September 2026. That means no confirmed listing, not a guarantee the lake is free of invasive species.
Public boat access
- Mule Lake (W): 1 concrete slab launch ramp, 1 dock, 11 trailer spaces. From Longville head south on Hwy 84 for 6.7 miles to the access. Directions
- Mule Lake: carry-in or shore access, 4 trailer spaces. 5 mi South of Longville on MN Hwy. 84, then 0.5 mile South and East on Township Road. Directions
DNR water access records (2023). Confirm current conditions with the DNR.
Nearby lakes
- Blackwater Lake 1.9 mi, Cass County
- Hunter Lake 1.9 mi, Cass County
- Wabedo Lake 2.1 mi, Cass County
- IXL Lake 3.0 mi, Cass County
- Hay Lake 3.0 mi, Cass County
- Island Lake 3.2 mi, Cass County
- Widow Lake 3.3 mi, Cass County
- Woman Lake 3.4 mi, Cass County
Questions about Mule Lake
How deep is Mule Lake?
Mule Lake reaches a maximum depth of 47 ft according to Minnesota DNR records. About 35% of the lake is shallower than 15 feet.
How big is Mule Lake?
Mule Lake covers about 524.6 acres in Cass County, Minnesota.
How clear is Mule Lake?
Summer water clarity on Mule Lake averages 18.1 feet (Secchi depth) in MPCA monitoring through 2025. Its trophic state is oligotrophic.
Does Mule Lake have zebra mussels or other invasive species?
Mule Lake is not on the Minnesota DNR infested waters list as of September 2026. That means there is no confirmed listing; it is not a guarantee the lake is free of invasive species.
What fish are in Mule Lake?
Minnesota DNR surveys document walleye, northern pike, largemouth bass, smallmouth bass, black crappie, bluegill, yellow perch, pumpkinseed, hybrid sunfish, rock bass in Mule Lake. The most recent standard survey was in 2022.
Where is the public boat access on Mule Lake?
Mule Lake has 2 public water access sites on DNR record: Mule Lake (W); Mule Lake.
How is the walleye population on Mule Lake?
In Minnesota DNR net surveys from 1991 to 2018, walleye numbers on Mule Lake ran mostly within the typical range for similar lakes. Nets measure how many fish a lake holds, not where they’re biting, so local guides are the best source for current fishing.
Are there lake homes for sale on Mule Lake?
Homes on Mule Lake come up for sale throughout the year, and some sell before they’re ever publicly advertised. Tell us what you’re looking for and our agents will run a custom search and send you matching homes on Mule Lake and nearby lakes, including off-market opportunities when available.
What is it like to live on Mule Lake?
A mid-size lake with room for boating and fishing, about 35% shallow shoreline under 15 feet, and summer clarity around 18.1 feet. Conditions vary by property, so walk the frontage and ask us what similar homes have sold for.
Are there special fishing regulations on Mule Lake?
No lake-specific regulation was found for Mule Lake in Minnesota Rules or the DNR sunfish list. Statewide and zone regulations apply.
Ask us about Mule Lake
Whether you’re buying, selling, or just curious, our team works Cass County lakes every day. Send us a note or call (218) 656-6469.
Sources: Minnesota DNR LakeFinder records, DNR fish surveys (latest 2022), DNR infested waters list (Sept 2026), Minnesota Rules 6264.0400 (April 2026), MPCA monitoring via the Water Quality Portal, DNR water access records (2023), LAGOS-US. Lakewide information from public data; it does not describe any specific property. Verify shoreline, bottom type, and depth at any frontage.