Ruby Lake
Itasca County, Minnesota, near Grand Rapids. DNR lake ID 31042200.
Ruby Lake is a 235.2-acre lake in Itasca County, Minnesota, near Grand Rapids. Its deepest point reaches 88 ft, and about 38% of the lake is shallower than 15 feet. Summer water clarity averages 17.0 feet in Minnesota Pollution Control Agency monitoring. 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 Ruby 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 | 31042200 |
|---|---|
| County | Itasca County, near Grand Rapids |
| Surface area | 235.2 acres |
| Maximum depth | 88 ft |
| Share under 15 ft | 38% |
| Water clarity (summer) | 17.0 ft through 2025 (satellite estimate) |
| Invasive species | Not on DNR infested waters list (Sept 2026) |
| Public water accesses | 0 |
Water quality
Summer averages from Minnesota Pollution Control Agency monitoring through 2025: clarity 17.0 ft.
Fishing on Ruby Lake
The most recent DNR standard fish survey was in 2017 (9 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 | gill | 3.17 | 1.0 to 5.0 |
| Northern pike | gill | 6.33 | 2.2 to 8.7 |
| Yellow perch | gill | 2.5 | 1.5 to 13.8 |
| Black crappie | gill | 0.17 | 0.3 to 1.7 |
| Bluegill | gill | 1.83 | n/a |
| Largemouth bass | gill | 1.33 | 0.5 to 1.7 |
| Smallmouth bass | gill | 0.33 | 0.2 to 1.6 |
| Pumpkinseed | gill | 3.67 | n/a |
| Rock bass | gill | 3.0 | 0.7 to 4.4 |
Walleye catch was within the typical range for similar lakes in that survey.
Largest fish measured in recent DNR samples: Smallmouth bass 17.0 in (2017), Largemouth bass 13.0 in (2017), Walleye 22.0 in (2017), Northern pike 29.0 in (2017).
Game and panfish documented since 2005: Walleye, Northern pike, Largemouth bass, Smallmouth bass, Black crappie, Bluegill, Yellow perch, Pumpkinseed, Rock bass, Tullibee (cisco), White sucker.
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
No public water access on DNR record.
Nearby lakes
- Little Island Lake 0.9 mi, Itasca County
- Blind Lake 1.1 mi, Itasca County
- Black Island Lake 1.1 mi, Itasca County
- Snowshoe Lake 1.4 mi, Itasca County
- Burnt Shanty Lake 1.5 mi, Itasca County
- Gunn Lake 1.7 mi, Itasca County
- Nose Lake 1.8 mi, Itasca County
- Spider Lake 2.2 mi, Itasca County
Questions about Ruby Lake
How deep is Ruby Lake?
Ruby Lake reaches a maximum depth of 88 ft according to Minnesota DNR records. About 38% of the lake is shallower than 15 feet.
How big is Ruby Lake?
Ruby Lake covers about 235.2 acres in Itasca County, Minnesota.
How clear is Ruby Lake?
Summer water clarity on Ruby Lake averages 17.0 feet (Secchi depth) in MPCA monitoring through 2025.
Does Ruby Lake have zebra mussels or other invasive species?
Ruby 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 Ruby Lake?
Minnesota DNR surveys document walleye, northern pike, largemouth bass, smallmouth bass, black crappie, bluegill, yellow perch, pumpkinseed, rock bass, tullibee (cisco) in Ruby Lake. The most recent standard survey was in 2017.
How is the walleye population on Ruby Lake?
In Minnesota DNR net surveys from 1990 to 2017, walleye numbers on Ruby 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 Ruby Lake?
Homes on Ruby 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 Ruby Lake and nearby lakes, including off-market opportunities when available.
What is it like to live on Ruby Lake?
Small, quiet water suited to paddling and fishing, about 38% shallow shoreline under 15 feet, and summer clarity around 17.0 feet. Conditions vary by property, so walk the frontage and ask us what similar homes have sold for.
Are there special fishing regulations on Ruby Lake?
No lake-specific regulation was found for Ruby Lake in Minnesota Rules or the DNR sunfish list. Statewide and zone regulations apply.
Ask us about Ruby Lake
Whether you’re buying, selling, or just curious, our team works Itasca County lakes every day. Send us a note or call (218) 656-6469.
Sources: Minnesota DNR LakeFinder records, DNR fish surveys (latest 2017), 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.