Thirty
A 121-acre lake near Nashwauk in Itasca County — best known for pike and panfish. Last surveyed 1986.
Fish Species (8)
Northern Pike
Typical numbers · large fish
Gill-net survey · surveyed Jul 1986
Last surveyed 1986 — treat with caution
Catch rate: 5.3 per gill net · typical 2.8–10 for a lake like this
Survey History
| Date | Catch Rate | Avg Length | Avg Weight |
|---|---|---|---|
| Jul 21, 1986 | 5.25 | - | 3.60 lbs |
| Jul 14, 1980 | 4.00 | - | 3.26 lbs |
| Jul 14, 1980 | 0.25 | - | 0.65 lbs |
Bluegill
Typical numbers · average-size fish
Trap-net survey · surveyed Jul 1986
Last surveyed 1986 — treat with caution
Catch rate: 8.0 per trap net · typical 3.1–24.9 for a lake like this
Survey History
| Date | Catch Rate | Avg Length | Avg Weight |
|---|---|---|---|
| Jul 21, 1986 | 8.00 | - | 0.24 lbs |
| Jul 21, 1986 | 8.00 | - | 0.27 lbs |
| Jul 14, 1980 | 41.00 | - | 0.27 lbs |
Black Crappie
Typical numbers · average-size fish
Trap-net survey · surveyed Jul 1986
Last surveyed 1986 — treat with caution
Catch rate: 7.8 per trap net · typical 1.9–13 for a lake like this
Survey History
| Date | Catch Rate | Avg Length | Avg Weight |
|---|---|---|---|
| Jul 21, 1986 | 7.25 | - | 0.41 lbs |
| Jul 21, 1986 | 7.75 | - | 0.25 lbs |
| Jul 14, 1980 | 5.00 | - | 0.34 lbs |
Largemouth Bass
Large fish
Gill-net survey · surveyed Jul 1986
Last surveyed 1986 — treat with caution
Catch rate: 1.5 per gill net · typical 0.9–4.3 for a lake like this
Survey History
| Date | Catch Rate | Avg Length | Avg Weight |
|---|---|---|---|
| Jul 21, 1986 | 1.50 | - | 1.65 lbs |
| Jul 14, 1980 | 0.75 | - | 1.23 lbs |
| Jul 14, 1980 | 1.20 | - | 1.33 lbs |
Yellow Perch
Typical numbers · average-size fish
Gill-net survey · surveyed Jul 1986
Last surveyed 1986 — treat with caution
Catch rate: 6.5 per gill net · typical 2.5–23.3 for a lake like this
Survey History
| Date | Catch Rate | Avg Length | Avg Weight |
|---|---|---|---|
| Jul 21, 1986 | 6.50 | - | 0.12 lbs |
| Jul 14, 1980 | 0.60 | - | 0.13 lbs |
Pumpkinseed
Below-normal numbers · average-size fish
Trap-net survey · surveyed Jul 1986
Last surveyed 1986 — treat with caution
Catch rate: 0.75 per trap net · typical 0.8–7.2 for a lake like this
Survey History
| Date | Catch Rate | Avg Length | Avg Weight |
|---|---|---|---|
| Jul 21, 1986 | 0.75 | - | 0.13 lbs |
| Jul 14, 1980 | 3.75 | - | 0.35 lbs |
Other species in this lake (2)
Rough fish, bullheads, and baitfish recorded in DNR surveys — present in the lake, but not typical angling targets.
Golden Shiner
Typical numbers · large fish
Gill-net survey · surveyed Jul 1986
Last surveyed 1986 — treat with caution
Catch rate: 0.5 per gill net · typical 0.5–5.1 for a lake like this
Survey History
| Date | Catch Rate | Avg Length | Avg Weight |
|---|---|---|---|
| Jul 21, 1986 | 0.50 | - | 0.15 lbs |
| Jul 21, 1986 | 0.25 | - | 0.20 lbs |
White Sucker
Below-normal numbers · large fish
Gill-net survey · surveyed Jul 1986
Last surveyed 1986 — treat with caution
Catch rate: 0.25 per gill net · typical 1–5.8 for a lake like this
Survey History
| Date | Catch Rate | Avg Length | Avg Weight |
|---|---|---|---|
| Jul 21, 1986 | 0.25 | - | 3.80 lbs |
| Jul 14, 1980 | 0.50 | - | 3.85 lbs |
Biologist Notes
July 21, 1986FISH POPULATION IS WITHIN NORMAL LIMITS FOR THIS TYPE OF LAKE.
FISH POPULATION IS WITHIN NORMAL LIMITS FOR THIS TYPE OF LAKE.
July 14, 1980Has not been stocked since 1965. Only fish stocked has been N Pike. Fish population appears to be within normal limits for this type of lake.
Has not been stocked since 1965. Only fish stocked has been N Pike. Fish population appears to be within normal limits for this type of lake.
Frequently Asked Questions
What fish can you catch in Thirty?
Based on Minnesota DNR survey data, anglers target Northern Pike, Bluegill, Black Crappie, Largemouth Bass, and Yellow Perch in Thirty. See the full species list above for catch rates, size structure, and quality scores.
Is there public access at Thirty?
We don't have a confirmed public access point on record for Thirty. Check the DNR LakeFinder page for current access details before you go.
How deep is Thirty?
Thirty has a maximum depth of 14 feet, per Minnesota DNR data.
When were the main sport fish in Thirty last surveyed?
The most recent Minnesota DNR survey data for the main sport fish in Thirty is from 1986. Surveys this old should be treated with some caution — fish populations change over time.
Does Thirty have any invasive species?
No invasive species are on record for Thirty in Minnesota DNR data. Always clean, drain, and dry your equipment to help keep it that way.
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Lake Details
- Surface Area
- 120.68 acres
- Max Depth
- 14 ft
- Shoreline
- 2 mi
- Public Access
- Not confirmed