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Red Rock Reservoir

General Information

County: Marion
Location: 4 miles north of Knoxville
Acres: 15250.00
Maximum Depth: 44 ft. (1987)
Motoring Restrictions: none


Amenities at Red Rock Reservoir include:
  • Boat Access
  • Boat Rental
  • Picnic Area
  • Beach
  • Trails
  • Accessible Facilities
  • Playground
  • Restrooms
  • Camping
  • Concessions
  • Hard Surface Boat Ramp

Fishing Report

For good summer fishing anglers should drift/slow troll the open water for bluegill and crappie. The Des Moines River Reservoirs are producing some good white bass fishing. For information on central Iowa's lakes and rivers contact Ben Dodd or Andy Otting at 515-432-2823.
White Bass - Good: White bass are hitting trolling shad imitating lip-less crankbaits near points or anywhere large schools of young shad are congregated. Anglers casting jigs and crankbaits below the spillway are also doing well on white bass and the occasional wiper.

Fishing Forecast

Red Rock Reservoir provides a diverse and quality fishery. A large fish sampling effort was completed in 2012 with additional gill netting during the fall of 2013. Largemouth bass were sampled in sizes from 9 to 18.5 inches with the largest group being 13 to 16 inches. Bluegill were sampled in sizes from 3 to 7.5 inches with most at sizes not desirable for angler harvest, which is common for large flood control reservoirs. Both black and white crappies are present in excellent numbers and quality size. Both species were similar size in 2013 running from 9 to 13 inches. Good to excellent crappie fishing should continue. White bass are very abundant from 6 to 18 inches and are a popular target for anglers during the summer months. A good group of 11 to 14 inch wipers were caught in 2013. These wipers will grow fast with the abundant shad and should be in the 17 to 20 inch range in 2014. Wipers were sampled over 20 inches. Channel catfish are also highly abundant with great numbers of fish from 17 to 28 inches. A good population of walleyes exist, although anglers usually only note the occasional catch. Walleyes were found in two size ranges in 2013 from 9 to 11 inches and 15.5 to 22 inches.(2013)

Lake Maps

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

Popular Fish Species at this Lake


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.