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Legendary Species · Iowa

Brook trout in Iowa

Salvelinus fontinalis[1]

10 Iowa waters whose agency species list names brook trout. Each links to its water page (gauge, regulations, access map, guides and shops) and to the agency list it comes from.

  • 10waters list it
  • 1destination hub
Illustration of a brook trout: dark green back with pale wavy markings, red spots with blue halos and white-edged lower fins
Brook trout (Salvelinus fontinalis), illustration by Duane Raver for the U.S. Fish and Wildlife Service. Artwork: Duane Raver, U.S. Fish and Wildlife Service, public domain, via Wikimedia Commons

Iowa waters

Most fished first. A species missing from an agency list does not mean it is absent; this page lists only waters whose list names it (at least 5 are needed for a page).

All Iowa watersBrook trout: every state

Identification

  • Brook trout have worm-like markings (vermiculations) on the back and red spots, sometimes with blue halos, on the sides. The lower fins have a white front edge, then black, then reddish orange.[1]
    What the source says
    “Color variations include olive, blue-gray or black above with a silvery white belly and wormlike markings (vermiculation pattern) along the back. They have red spots sometimes surrounded by bluish halos on their sides. The lower fins have a white front edge followed by black and the remainder being reddish orange.”
  • In California, the brook trout is the only trout with wavy, maze-like lines (vermiculations) on its back and upper sides.[2]
    What the source says
    “Only trout in California with vermiculation pattern (wavy, maze-like lines) on back and upper sides.”
  • Brook trout belong to the char family and are often confused with bull trout. Brook trout have vermiculations and black spots on the dorsal fin, which bull trout lack.[3]
    What the source says
    “Closely related to and commonly misidentified as brook trout (both are members of the char family). A distinguishing characteristic is the lack of black spots on the dorsal fin. Do not have vermiculations that occur on brook trout.”

More on identifying brook trout

Status, protections and rules

As each agency stated them on the date read; a rule applies only where its agency says so. Check the current regulations for the water before you fish.

  • In Great Smoky Mountains National Park, the brook trout is the only native trout species.[4]
    What the source says
    “The brook trout is the only native species of trout in the Smokies.”
  • Great Smoky Mountains National Park reopened brook trout fishing in 2006 after a 30-year ban.[5]
    What the source says
    “As a result of research and successful restoration efforts, park management reopened brook trout fishing in 2006 after a 30-year ban.”

Water temperature in Iowa

Iowa DNR publishes no water-temperature line for trout anglers that we found. The lines below are the National Park Service's, federal guidance, not a Iowa rule, with Iowa DNR's own figure added:

  • Under the federal 68°F lineThat is under the 68°F at which the National Park Service, at Grand Teton National Park, recommends anglers stop fishing in the afternoon (“cease fishing at 2 p.m. when water temperatures are likely to exceed 68°F”). Water warms through the afternoon, so check again later in the day: “Carry a pocket thermometer to monitor water temperature.”
  • Stressful for troutAt 68°F the U.S. Fish and Wildlife Service says rainbow trout “start stressing”, and the National Park Service at Grand Teton recommends that anglers “cease fishing at 2 p.m. when water temperatures are likely to exceed 68°F.” Its advice: “Fish early in the morning while the water temperature is cooler”, “Play and land fish quickly to reduce exhaustion stress” and “Keep the fish in the water as much as possible.”
  • Over 75°F: Iowa DNR's maximumIowa DNR: “The maximum water temperature for trout is 75 degrees.”

Sources: High water temperatures prompt fishing advisory in Grand Teton National Park (29 July 2022) (National Park Service); Up a climate-stressed creek (9 June 2023) (U.S. Fish and Wildlife Service); Trout (Iowa Department of Natural Resources).

Destination hubs

Hubs that list one of these waters, or that a water page is near: each has guides, shops, licences and trip planning for the area.

Hatch & season charts

Sources

Every fact on this page is our paraphrase of the page cited beside it, read on the date shown. Rules and seasons change: check the agency's current regulations before you fish.

  1. Brook trout Michigan Department of Natural Resources, read Oct 24, 2026.
  2. Fishing for Brook Trout (non-native) California Department of Fish and Wildlife, read Oct 24, 2026.
  3. Fishing for Bull Trout (native) California Department of Fish and Wildlife, read Oct 24, 2026.
  4. Fishing - Great Smoky Mountains National Park (U.S. National Park Service) National Park Service, read Oct 24, 2026.
  5. Fish - Great Smoky Mountains National Park (U.S. National Park Service) National Park Service, read Oct 24, 2026.