Trout Species of Arkansas

Arkansas is a warm-climate state. Summer surface-water temperatures across the Ozarks routinely exceed 80°F — far above what trout can survive. Trout exist in Arkansas because three Army Corps of Engineers dams built in the mid-twentieth century release cold water from the bottom of large reservoirs:

• Bull Shoals Dam (1951) on the White River — created the largest tailwater trout fishery in the South. Cold dam-release water supports trophy browns and stocked rainbows from the dam through Lakeview, Cotter, and the confluence with the Norfork tailwater.
• Norfork Dam (1944) on the North Fork River — short, intensely productive tailwater that joins the White just downstream. Trophy browns and stocked rainbows in fast Ozark cold water.
• Greers Ferry Dam (1962) on the Little Red River — heavy hydropeaking tailwater that produced the world-record brown trout in 1992. CFS swings 200 to 5,000+ within hours when generators kick on.
• Mammoth Spring (Spring River) — not a dam at all but one of the largest natural springs in the world. Discharges rock-steady ~270 CFS at 58°F year-round, supporting stocked rainbows for the first miles below the spring.

For a fly angler this means species ID is simple — Arkansas is two-species water — and the real intelligence is reading the generation schedule and the gauge before driving.

Non-native (introduced) — Bull Shoals, Norfork, and Greers Ferry tailwaters

The Brown Trout (Salmo trutta) is the trophy fish of Arkansas. Introduced from Europe and stocked across the major tailwaters, browns thrive in the cold dam-release water, reach enormous size on a forage base of shad, sculpins, scuds, and crayfish, and reproduce in some sections. The Little Red River below Greers Ferry produced the all-tackle world-record brown trout on May 9, 1992 — 40 pounds, 4 ounces — the largest brown trout ever caught anywhere on Earth.

Non-native (stocked) — every Arkansas trout water

The Rainbow Trout (Oncorhynchus mykiss) is the primary stocked species across every Arkansas trout water — the Bull Shoals and Norfork tailwaters, the Greers Ferry tailwater, the Spring River below Mammoth Spring, and Crooked Creek near Yellville. AGFC maintains a regular stocking schedule across the major tailwaters; rainbows reproduce naturally in some sections (notably parts of the Norfork tailwater) but the fishery as a whole is stocking-driven.

For visiting anglers used to Western or Northeastern trout country, the Arkansas tailwaters are a different kind of fishery. Understanding the ecosystem helps:

• Bottom-release dams — Bull Shoals, Norfork, and Greers Ferry all release cold water from the bottom of their reservoirs. Surface temps in summer would kill trout; bottom temps stay around 50°F year-round.
• Hydropeaking — power generation drives flow. CFS can spike from a few hundred to several thousand within an hour when generators kick on. The Little Red below Greers Ferry is the most volatile.
• Scud and midge factories — cold mineral-rich tailwater grows enormous populations of scuds (size 14-18, olive/orange/pink) and midges (size 20-24) that drive the fishery year-round.
• Mammoth Spring is different — the Spring River is fed by a natural spring rather than a dam, so flow is rock-steady at ~270 CFS and temperature is constant at 58°F year-round. No generation schedule to read.
• No native trout — Arkansas has no native cold-water trout species. Every brown and rainbow in the state is descended from stocked fish, even in sections where they reproduce naturally.

For anglers visiting from other regions, it helps to know what Arkansas does not have:

• No native brook trout — Arkansas has no brook trout populations. Brookies require cold spring-fed headwaters that the Ozark hill country doesn’t support outside of dam releases.
• No cutthroat trout — Cutthroat are a Western species; Arkansas has none.
• No steelhead or salmon — Arkansas has no Great Lakes or Pacific frontage; no anadromous salmonid runs.
• No native trout, period — every trout in Arkansas is the legacy of stocking programs that began after Bull Shoals Dam went online in 1951.