Manitowoc County Lakes Association

to protect and enhance area lakes for the benefit of all

Hartlaub Lake

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    End-of-year Phosphorous Impairment Data Available

    a bar graph of all county lakes showing eight exceeding recommended phosphorus levels

    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.

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    June 2020 Lake Reports

    Despite the cancellation of our spring and summer 2020 membership meetings, MCLA continues to monitor lake conditions in the county through the reports of lake directors.

    In June, reports were submitted for Cedar, Bullhead, Hartlaub, Silver and Pigeon Lakes.

    read full article

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Hartlaub Lake, April 2015
by Ken & Karen Schuler,

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


  • 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:


  • 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 Seepage. Deep Seepage lakes stratify, or form separate layers of water, during the summer months and have no inlet or outlet.
  • Lat/Long: 44.04516470, -87.73757110

Aquatic Invasive Species Threats


  • Fish present: Bluegill and largemouth bass common; northern pike, walleye, perch, and other panfish present.


  • View Hartlaub Lake fishing regulations on DNR website
  • Open All Year
    • Panfish: Daily bag limit 25. No min length.
    • Catfish: Daily bag limit 10. No min length.
  • Open 5/1/2021-3/6/2022:
    • Largemouth/smallmouth bass: 14″ Limit 5.
    • Northern Pike: 26″ Limit 2.
    • Walleye: 15″ Limit 5.
  • Motor Trolling is allowed with up to 3 hooks, baits, or lures, per angler.
  • Familiarize yourself with Wisconsin fishing:
    WDNR Hook & Line Guide
  • Consumption Advisory: General Manitowoc County/Mercury. Click here.

Stocking and DNR Surveys

Summary of DNR Species Sampling (2013)
Number Size range (ave)
Common Carp 33 (26.5″)
Yellow Bullhead 3 (11.8″)
Bluegill 65 2.5-5.7″ (4.2″)
Largemouth Bass 28 3.1-19.3″ (11.5″)
Black Crappie 3 (6.2″)
Yellow Perch 1 (5.7″)
Walleye 2 (22.1″)
Total 135

DNR Conclusions from 2013 Survey:

  • Heavy growth of filamentous algae noted.
  • Multiple missing bass age classes, likely due to poor water quality.
  • Survival of walleye continues to be low.
  • Overabundance of slow-growing bluegill due to poor water quality, lack of predation and competition for resources.
  • It is important to continue to work with the Manitowoc County Soil and Water Department, MCLA, other lake associations, sportsmen and lake residents to try to improve water quality and mitigate lost habitat to improve the fishery.
  • Future surveys should be conducted to determine if regulation changes or predator stocking is needed.


DNR Fish Stocking Data
Year Species Strain Age Class Number Stocked Average Length (inches)
View more history

Condition: FAIR (2020) Source

  • 5-Year Average Trophic State: 57/Eutrophic 
  • Secchi Disk: Average summer reading 2.67 ft. (SE Georegion average 6.5 ft.) Summer (July/Aug) water was reported as MURKY and GREEN.
    This suggests that the secchi depth may be mostly impacted by algae. Algal blooms are generally considered to decrease the aesthetic appeal of a lake because people prefer clearer water to swim in and look at. Algae are always present in a balanced lake ecosystem; they are eaten by zooplankton, which are in turn eaten by fish. 
    a data graph shows declining clarity since 1996 with 2019 and 2020 being markedly worse
  • Chemistry:
    Average summer Chlorophyll 41.7 µg/l (SE Georegion average of 21.7 µg/l).
    Average summer Total Phosphorus 51.4 µg/l.
    Lakes that have more than 20 µg/l and impoundments that have more than 30 µg/l of total phosphorus may experience noticeable algae blooms.
  • Trophic State Index (TSI): 63/Eutrophic. What does this mean?
    Eutrophic lakes are high in nutrients and contain large populations of plants, algae, and fish, which often grow to nuisance levels, and the fish species are generally tolerant of warm temperatures and low oxygen conditions. Phosphorus can fuel algae blooms. 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.

View TSI data graph on the DNR website


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.  
Updated: June 23, 2021 — 7:44 am

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