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Darren Kuhn has collected many stories in his career as a recreation safety warden, along with a strong desire for people to stay safe while having fun. Kuhn, who works for the state Department of Natural Resources, recently spoke to the Manitowoc County Lakes Association during a meeting in Manitowoc.
Phosphorous levels are slowly increasing in Manitowoc County lakes.
Gene Weyer, water quality testing director and former president of the Manitowoc County Lakes Association, displayed graphs of phosphorous levels on 16 area lakes to those gathered at the association’s Feb. 21 meeting.read full article
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.
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
- 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: http://www.co.manitowoc.wi.us/departments/parks/lake-access/hartlaub-lake/
- 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
- Verified: Curly-Leaf Pondweed (2010), Eurasian Water-Milfoil (2009), Hybrid Eurasian / Northern Water-Milfoil (2011)
- 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 5/4/2019-3/1/2020:
- 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)|
|Largemouth Bass||28||3.1-19.3″ (11.5″)|
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)|
|1998||NORTHERN PIKE||LAKE PUCKAWAY||LARGE FINGERLING||170||7.90″|
|1997||NORTHERN PIKE||UNSPECIFIED||LARGE FINGERLING||68||8.10″|
|1997||LARGEMOUTH BASS||UNSPECIFIED||LARGE FINGERLING||100||6.00″|
|View more history|
Condition: FAIR (2018) Source
- 5-Year Average Trophic State: 54/Eutrophic
- Secchi Disk: Average summer reading 4.79 ft. (SE Georegion average 7.4 ft.) Summer (July/Aug) water was reported as CLEAR 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.
Average summer Chlorophyll 11.6 µg/l (SE Georegion average of 31.6 µg/l).
Average summer Total Phosphorus 31 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): 53/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.