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

  • 06/28/2021 - 1,449 Largemouth Bass (1.6)
  • 06/18/2021 - 20,772 Yellow Perch (1)
  • 04/08/2021 - 40,396 Northern Pike (Fry)
  • 06/06/2018 - 1,755 Bluegill (4)
  • 06/05/2018 - 2,762 Northern Pike (2.7)
  • 05/02/2018 - 250 Yellow Perch (7.5)
  • 04/27/2018 - 25,740 Northern Pike (Fry)
  • 10/11/2013 - 907 Largemouth Bass (3.75")
    No known aquatic invasive species have been found
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:
Since 2009, common carp and bullhead numbers have increased in Diamond Lake and some signs of water quality are diminishing. A complete renovation is planned with water levels lowered through the fall and winter (2017) to eliminate the undesirable fish populations in Diamond Lake. Drawdown of the lake will be short term with fish stocking and water levels returning during the spring 2018. After restocking, fish growth will be extreme with northern pike and yellow perch approaching angler acceptable size by the end of the second growing season. (2018)
Tip: Click the arrow in the lower right corner to view the Fish Survey Data tool in full-screen mode.


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.