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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

No recent updates

Fishing Forecast

Martens Lake is a 255 acre marsh primarily managed for waterfowl but also provides fish angling opportunities as well. The lake contains largemouth bass, bluegill, crappies, northern pike and bullheads. During the summer of 1997 Eurasian Watermillfoil (EWM), and Brittle Naiad years later, were discovered throughout most of the Sweet Marsh complex. Extensive efforts have been taken over many years to control the spread of these aquatic invasive species but control has been difficult. During the summer of 2011 and 2012 fisheries, wildlife and aquatic invasive species (AIS) staff implemented drawdowns in Martens Lake. These invasive plants remain within the system but are supressed due to water level manipulations versus high cost of chemical treatment applications.(2013)

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.