O'Brien Lake
Iron County, Wisconsin · WBIC 2928400
This lake has fishing rules that differ from the standard ones for its area. Check the official rules before you fish. Official regulations
Size
79 acres
Max depth
12 ft
DNR lake type
Simple, Cool, clear water color
Water clarity
1 ft
Low, measured Oct 2018
A cool-water lake type: the DNR groups it with lakes that stay cooler through summer. This describes the lake type in general, not this lake in particular.
Outline
Numbered dots are boat landings; tap one for directions. The list below has the same numbers. Drawn from the DNR's 24K hydrography (surveyed 1956), so the shape is approximate and a landing can sit a little off the shore. Open the DNR lake map.
Water clarity
1 ft Secchi depthLowOlder reading
Last measured Oct 23, 2018. 8 readings on record, 2018.
Nothing has been measured in the last 5 years, so this may not match the lake today.
Secchi depth is how far down a white disk stays visible. A bigger number means clearer water. Clear means a Secchi depth of 10 feet or more, moderate 5 to 10 feet, low under 5 feet.
Wisconsin DNR water monitoring (volunteer and staff), via the Water Quality Portal; station O'Brien Lake - Deepest Spot. Checked Oct 23, 2026.
Today at the lake
Forecast: National Weather Service (no endorsement implied). Sunrise, sunset and moon phase are calculated. The moon phase can be a day off.
Stocking history
- Largemouth Basslast stocked 2014 (large fingerling); stocked in 3 years since 2010
Stocking shows what was added to the lake, not what is in it now.
Wisconsin DNR annual fish stocking summary. Checked Oct 23, 2026.
Fish recorded near this lake
- Black Bullhead Ameiurus melas1978; 1 record
- Black Crappie Pomoxis nigromaculatus1988; 1 record
- Brook Trout Salvelinus fontinalis1978; 1 record
- Largemouth Bass Micropterus salmoides1977 to 1991; 3 records
- Rock Bass Ambloplites rupestris1978 to 1988; 2 records
- White Sucker Catostomus commersonii1977 to 1988; 4 records
- Yellow Perch Perca flavescens1977 to 1988; 5 records
Recorded in open fish survey and museum records (GBIF). A record shows a fish was found near this lake in that year, not that it is there now, and says nothing about how many. Most coordinates are rounded to about 1 km, so a record is attached only when one lake is the clear match.
Open fish survey and museum records from GBIF; datasets are listed on the sources page. Checked Oct 23, 2026.
Boat landings
- 1O'Brien Lake AccessBoat ramp · Gravel surface · County
Directions
Wisconsin DNR public boat access sites. Checked Oct 23, 2026.
More lakes in Iron County
- Shirley Lake2.0 miles away
- Fifteen Lake2.6 miles away
- Shine Lake3.6 miles away
- Pleasant Lake3.8 miles away
- Sack Lake4.0 miles away
- Island Lake5.1 miles away
Where this comes from
- Size, depth and lake typeWisconsin DNR lake classifications, checked Oct 23, 2026
- OutlineWisconsin DNR 24K hydrography, checked Oct 23, 2026
- Stocking historyWisconsin DNR annual fish stocking summary, checked Oct 23, 2026
- Regulations linkWisconsin DNR fishing regulations (linked, not restated), checked Oct 23, 2026
- Boat landingsWisconsin DNR public boat access sites, checked Oct 23, 2026
- Water clarityWisconsin DNR water monitoring, via the Water Quality Portal, checked Oct 23, 2026
- Fish recordedOpen fish survey and museum records, via GBIF, checked Oct 23, 2026
- VHS statusWisconsin DNR VHS status by watershed, checked Oct 24, 2026
See data sources for what each source covers, and about for how the numbers are matched to lakes.
Something wrong on this page? Report a problem.