Mariposa Lake

General Information

County: Jasper
Location: 5 miles northeast of Newton
Acres: 17.90
Maximum Depth: 12 ft. (2004 - Information from Jasper County Conservation Board.)
Motoring Restrictions:

Nearby Parks

Rock Creek State Park


Amenities at Mariposa Lake include:
  • Picnic Area
  • Restrooms
  • Camping
  • Good/Excellent Shorefishing
No recent updates
Download Printable Lake Map

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

  • 09/26/2013 - 182 Channel Catfish (8.2")
  • 09/08/2011 - 239 Channel Catfish (8.3")
  • 09/15/2009 - 255 Channel Catfish (8.0")
  • 06/09/2008 - 1,200 Channel Catfish (4.4")
The Fishing Regulations brochure is available for download. The summaries listed below are a partial listing provided for your benefit.

  • Bluegill
    • Season: Continuous
    • Daily Bag Limit: 25 fish
    • Possession Limit: unlimited
    • Length Limit: none
    • Other: No daily limit on private waters
  • Channel Catfish
    • Season: Continuous
    • Daily Bag Limit: combined: channel, blue and flathead catfish, 8 fish
    • Possession Limit: combined: channel, blue and flathead catfish, 30 fish
    • Length Limit: none
    • Other:
  • Common Carp
    • Season: Continuous
    • Daily Bag Limit: none
    • Possession Limit: unlimited
    • Length Limit: none
    • Other: May be taken by hand fishing, by snagging, by spear or by bow and arrow, day or night.
  • 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:
Bluegill are abundant in sizes from 7 to 8 inches. Black crappie numbers are good with most fish falling in the 8 to 10 inch range. Most largemouth bass surveyed were 8 to 13 inches, but fish up to 18 inches were observed. Mariposa Lake is scheduled to be drained during the summer of 2016 for dredging and boat ramp construction. Fishing regulations have been relaxed prior to this work. Fish may be harvested at any size with no bag limit using legal methods of angling.(2016)


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.