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Martens Lake

General Information

County: Bremer
Location: 1 mi E of Tripoli
Acres: 255.00
Maximum Depth:
Motoring Restrictions: No Size Limit at No Wake


Amenities at Martens Lake include:
  • Boat Access
  • Hard Surface Boat Ramp

Fishing Report

The weekend forecast continues on a warming trend, ice cover still remains variable across many lakes in the Black Hawk County area with ice thickness ranging anywhere from 3"- 5". Use extreme caution when venturing out onto the ice. For further information contact the Manchester District Office @ 563-927-3276.
There have reports of anglers catching some crappie on Martens Lake. With the recent onset of warm temperatures ahead, take extreme caution when crossing the reservoir from the north side parking area.
Crappie - Fair: Try tipping a small ice fishing jig with a waxworm or tipping a crappie minnow on a small hook under a bobber.

Fishing Forecast

Martens Lake in Sweet Marsh is a consistent producer of quality-sized largemouth bass and provides good opportunities for bluegill and crappie. Martens Lake has abundant vegetation during summer months so many anglers prefer fishing for panfish during winter and early spring.(2014)

Lake Maps

Download Printable Lake Map

You can zoom in on the map for bathymetric information for some lakes

Popular Fish Species at this Lake

Fish Stocking

  • 05/06/2005 - 838 Northern Pike (2.3")
  • 05/12/2004 - 402 Northern Pike (2")


The Fishing Regulations brochure is available for download. The summaries listed below are a partial listing provided for your benefit.

  • Black Bullhead
    • Season: Continuous
    • Daily Bag Limit: unlimited
    • Possession Limit: unlimited
    • Length Limit: none
    • Other:
  • Black Crappie
    • Season: Continuous
    • Daily Bag Limit: combined black and white crappie, 25 fish
    • Possession Limit: unlimited
    • Length Limit: none
    • Other: No daily limit on private waters
  • Bluegill
    • Season: Continuous
    • Daily Bag Limit: 25 fish
    • Possession Limit: unlimited
    • Length Limit: none
    • Other: No daily limit on private waters
  • Largemouth Bass
    • Season: Continuous
    • Daily Bag Limit: combined black bass, 3 fish
    • Possession Limit: combined black bass, 6 fish
    • Length Limit: 15-inch minimum
    • Other:

Fish Surveys

Lake Fish Survey Data Data from the most recent fisheries survey of this lake is provided on this external web site. This data may include information from various netting surveys and/or electroshocking surveys. Data includes numbers of fish sampled, and fish size ranges. Not all lakes are sampled every year.

Lake Mini-report

Lake Reports Summary report information about selected (~130) lakes regarding water quality, upstream land use, usage, economic value and more. Reports are customizable by the user to include only that information which the user desires to include.

Water Quality

Iowa-Caught Fish Are Safe to Eat, In Almost All Cases

The vast majority of Iowa’s streams, rivers and lakes offer safe and high-quality fish that pose little or no threat to human health if consumed. Some limitations may apply for young children and pregnant women. Here’s a Fish Consumption Fact Sheet from the Iowa DNR and the Iowa Dept. of Public Health for more information. Here is a list of current fish consumption advisories for Iowa lakes and rivers.