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Data Report Courtesy of Gene Weyer A graph created by Gene Weyer shows the updated Phosphorus Levels to include lake samples for 2020. Most Manitowoc County lakes completed the normal 3 summertime samples. End-of-year 2020 Phosphorous Impairment Data Available
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Click on the maps to enlarge. Bathymetric Map Courtesy of and Copyright Sportsman’s Connection, based on Wisconsin DNR data. Watershed map courtesy of Manitowoc County Soil and Water Conservation Department. New! Zoom in even closer with this new interactive watershed mapping tool.
MCLA Lake Director: Gene Weyer
Directions: Hartlaub Lake Road, Town of Newton. Take Highway 42 South from Manitowoc 2 miles to English Lake Road. East on English Lake Road .3 miles to Hartlaub Lake Road. East on Hartlaub Lake Road to boat landing.
About Hartlaub Lake
- Condition: Fair/Eutrophic read more
Recreation
- Recreational Features: Blacktopped parking for 8 car/trailer units. Due to the soft bottom of the lake, a 60 foot port-a-pier has been installed for easier access. No potable water, no lighting, no restrooms.
- Boat ramp: Paved, 5% slope, Shallow <3 ft launch depth.
- ADA Accessibility Features: None.
- Restrictions: Electric motors only. Motorboat Prohibition, Slow-No-Wake Areas/Hours, Water Skiing Restrictions. See posted and Wisconsin boating handbook
- Note: Access road barricaded in winter.
- Manitowoc County Map and Photos: https://manitowoccountywi.gov/departments/parks/lake-access/hartlaub-lake/
Statistics
- Surface Area: 37 acres
- Depth: Max 60′, Mean 20′
- Shorelength: 1.2 mi
- Bottom: 0% sand, 10% gravel, 0% rock, 90% muck
- Type of Lake: Deep headwater drainage.
- Lat/Long: 44.04516470, -87.73757110
Aquatic Invasive Species Threats
- Verified: Curly-Leaf Pondweed (2010), Eurasian Water-Milfoil (2009), Hybrid Eurasian / Northern Water-Milfoil (2011)
Fishing
- Fish present: Bluegill and largemouth bass common; northern pike, walleye, perch, and other panfish present.
Regulations
- Open All Year
- Panfish: Daily bag limit 25. No min length.
- Catfish: Daily bag limit 10. No min length.
- Open May 4, 2023 – March 2, 2025:
- Largemouth/smallmouth bass: 14″ Limit 5.
- Northern Pike: 26″ Limit 2.
- Walleye: 15″ Limit 3.
- Motor Trolling is allowed with up to 3 hooks, baits, or lures, per angler.
- View Hartlaub Lake fishing regulations on DNR website and familiarize yourself with Wisconsin fishing: WDNR Hook & Line Guide
- Consumption Advisory: General Manitowoc County/Mercury. Click here.
Stocking and DNR Surveys
| DNR Fish Stocking Data | |||||
|---|---|---|---|---|---|
| Year | Species | Strain | Age Class | Number Stocked | Average Length (inches) |
| 2019 | WALLEYE | ROCK-FOX | SMALL FINGERLING | 1,225 | 1.70 |
| 2019 | WALLEYE | UNSPEC | LG FINGERLING | 300 | 8 |
| 2006 | WALLEYE | UNSPEC | LG FINGERLING | 605 | 6 |
| View more history | |||||
Condition: FAIR (2023) Source
New! Explore lake data with the DNR’s WEx Water Explorer Tool
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- 2023 Trophic State: 54/Eutrophic. Based on Chlorophyll.
What does this mean?
This TSI usually suggests decreased clarity, fewer algal species, oxygen-depleted bottom waters during the summer, plant overgrowth evident, warm-water fisheries (pike, perch, bass, etc.) only. - 2023 Secchi Disk: Average summer reading 5.1 ft. Summer water was reported as GREEN with algae present.
- 5-year Average Summer Chemistry:
Summer Chlorophyll 26.3 µg/l.
Summer Total Phosphorus 42 µg/l.
TSI: 58. Based on Chlorophyll readings.
- 10-year Average late summer trophic status compared to other deep headwater lakes. Averages (red) from the last 10 years compared to other lakes (gray).
It would be nice if the boat landing area and a channel to the main area could be dredged out a bit. We have a plastic two-person bass boat with a trolling motor and even with that it’s really difficult – we need to use the paddles which are meant for emergencies. We’re senior citizens; we tried fishing here twice this year and determined that although we love it, we’re not physically up to the challenge.