Diamond Lake

General Information

County: Dickinson
Location: 2 miles east, 2 miles north of Montgomery
Acres: 143.00
Maximum Depth: 7 ft. (1991)
Motoring Restrictions: none

Nearby Parks

Lower Gar State Recreation Area
Mini-Wakan State Park
Trappers Bay State Park
Gull Point State Park
Gull Point State Park
Marble Beach State Recreation Area
Emerson Bay State Recreation Area
Elinor Bedell State Park
Pikes Point State Park
Templar State Recreation Area


Amenities at Diamond Lake include:
  • Boat Access
  • Hard Surface Boat Ramp
  • Accessible Shoreline
No recent updates

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

  • 10/11/2013 - 907 Largemouth Bass (3.75")
  • 06/15/2010 - 105,280 Yellow Perch (3")
  • 05/18/2010 - 2,687 Northern Pike (2.5")
  • 04/15/2010 - 26,850 Northern Pike (1":)
  • 06/17/2009 - 72,963 Yellow Perch (1.3")
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:
  • 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:
  • Northern Pike
    • Season: Continuous, except for boundary lakes
    • Daily Bag Limit: 3 fish
    • Possession Limit: 6 fish
    • Length Limit: none
    • Other: Except for border lakes
  • Yellow Perch
    • Season: Continuous
    • Daily Bag Limit: 25 fish
    • Possession Limit: 50 fish
    • Length Limit: none
    • Other:
Diamond Lake will continue to provide northern pike angler’s quality fishing throughout the 2017 fishing season. Northern pike anglers will continue to harvest good numbers of acceptable size and larger fish during the 2017 angling season. Best fishing action will occur during the early spring and late fall; however, don’t overlook the early winter season for the best action and increased opportunities for this species. (2017)


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.