Trout Species of Maryland | Nerd on the Fly

Maryland is a three-species state for fly anglers: large wild brown trout dominate the Gunpowder Falls and Savage River tailwaters, wild and stocked rainbows fill out the cold-water reaches, and native brook trout still hold in the Casselman headwaters and the federally protected Big Hunting Creek population in Catoctin Mountain Park. The Big Hunting Creek wild brookies are a conservation priority — one of the southernmost wild brook trout populations on the East Coast and the reason the stream has been managed fly-fishing-only catch-and-release since 1974. Here's how to tell them apart and where each one lives.

Brown Trout

Introduced — the dominant wild trout species; trophy fish on Gunpowder and Savage tailwaters

Brown trout are not native to Maryland but they have become the state's signature wild trout — particularly on the cold tailwaters where they grow large and selective. The Gunpowder Falls below Prettyboy Reservoir produces some of the most technical wild brown trout fishing in the eastern United States: fish keyed on size 22-28 midges and size 22-24 tricos, with strong populations of 12-18\" wild fish through the 7.2-mile catch-and-release section. The Savage River tailwater is a Trophy Trout designation with an 18-inch brown trout minimum and regularly produces 18-22\" wild browns in canyon water that hosted the World Fly Fishing Championship in 1992.

ID at a glance

BackgroundOlive-brown back fading to golden-yellow flanks. Color varies — Gunpowder fish run silvery-grey; Savage canyon fish run buttery yellow.

SpottingDark spots (black-to-brown) on the back and flanks, often with light halos around upper-body spots. Red or orange spots scattered along the lateral line, often with bluish halos.

TailFew or no spots on the tail — distinguishes from rainbows. Tail edge typically square or only slightly forked.

Typical size10–14 inches in most freestone streams; 12–18 inches on Gunpowder C&R; 18–22+ inches on Savage Trophy Trout tailwater.

Where to find them

The marquee waters: Gunpowder Falls (Prettyboy Dam to Bluemount Road C&R section), Savage River (entire 4-mile tailwater Trophy Trout section), the North Branch Potomac below Jennings Randolph Dam, Big Hunting Creek in Catoctin Mountain Park (alongside the native brookies), and the Casselman and Youghiogheny in Garrett County.

How they fish

Selective and educated on the heavily fished tailwaters; the Gunpowder in particular demands long leaders, 6X-7X tippets, and small-fly precision (size 22-28 midges, size 22 BWOs, size 18-22 sulphurs and tricos). The Savage rewards reading canyon seams and matching the prolific sulphur emergence in May and June. Best season: year-round on tailwaters (Gunpowder, Savage, NBP), April through November on freestone water.

Rainbow Trout

Introduced — wild on Savage and NBP; stocked statewide

Rainbows are stocked across Maryland in the spring and fall through the DNR's annual program and provide the put-and-take backbone of the fishery. Wild reproduction is uncommon outside the Western Maryland tailwaters — the Savage River and the North Branch Potomac both support wild rainbow populations in their cold canyon tailwater reaches. These naturalized fish behave like Western tailwater rainbows and can grow large in the productive discharge water.

ID at a glance

Lateral bandPink-to-red stripe running the length of the body. Vivid on wild Savage and NBP fish; sometimes faint on freshly stocked rainbows.

SpottingSmall black spots scattered across the back, flanks, dorsal fin, and across the entire tail.

TailForked tail with spots throughout — distinguishes from brown trout (no tail spots) and brookies (no spots on body).

Typical size9–12 inches stocked; 12–18 inches on Savage and NBP.

How they fish

Stocked rainbows aren't picky — small attractor dries, hare's-ear nymphs, and beadhead caddis pupae produce. Wild Savage and NBP rainbows are a different animal: they hold in tailwater seams, key on midges and small mayflies, and demand 5X-and-down tippet on bright days. Best season: April through June for stocked fish, year-round on the Savage and NBP tailwaters.

Brook Trout

Native — Maryland's only native salmonid; the Big Hunting Creek wild population is a conservation priority

Brook trout are the only trout native to Maryland. The state's most significant wild brook trout population lives in Big Hunting Creek inside Catoctin Mountain Park and Cunningham Falls State Park, where the entire stream has been managed fly-fishing-only catch-and-release continuously since 1974 — one of the oldest such designations on the East Coast. The Casselman headwaters in Garrett County hold native brookies in cold pastoral freestone water, and small populations persist in scattered tributaries across the western Maryland mountains.

ID at a glance

Back markingsOlive-to-dark-green back covered in light, worm-like squiggles (vermiculations). Diagnostic — no other Maryland trout has them.

SpottingRed spots surrounded by blue halos along the flanks. The blue halos are the giveaway.

Belly and finsBrilliant orange-to-red belly, especially in fall on spawning fish. Lower fins (anal, pelvic, pectoral) bright orange with a striking white leading edge and a black stripe just behind the white.

Typical size6–10 inches in most streams; 8–12 inches in better water; the rare Big Hunting Creek 14-incher in cold pools.

Where to find them

Big Hunting Creek in Catoctin Mountain Park is the marquee water — the wild population here is the reason the stream has been protected for 50 years. The Casselman headwaters near Grantsville hold cold pastoral freestone brookies. Smaller populations persist in the upper reaches of the Youghiogheny tributaries in Garrett County and in scattered cold western Maryland streams.

How they fish

Aggressive opportunists in clean, cold water. Big Hunting Creek brookies are not selective — they live in low-productivity mountain water and they eat what passes — but they are spooky. Small attractor dries (Adams, Royal Wulff, Stimulator) and beadhead nymphs (Hare's Ear, Pheasant Tail) produce. The challenge is the cathedral canopy and the precise short-line presentations the small water demands. Best season: April through early July and again September through October.

Why Big Hunting Creek matters: The wild brook trout in Big Hunting Creek represent one of the southernmost self-sustaining wild brook trout populations on the East Coast. The Catoctin Park designation as fly-fishing-only, catch-and-release water since 1974 has protected this population through decades of pressure that would have wiped out a less resilient fishery. Treat the stream accordingly: barbless hooks, wet hands, quick releases, no photos out of water.

Quick Reference

Species	Status	Typical size	Best water	Peak season	Signature hatch / fly
Brown Trout	Introduced	10–22+ in	Gunpowder Falls C&R, Savage Trophy Trout, NBP, Big Hunting Creek, Casselman, Yough	Year-round tailwaters; April–Nov freestone	Sulphur, Trico, Caddis, Midge, BWO
Rainbow Trout	Introduced	9–18 in	Wild on Savage and NBP; stocked statewide	Spring/fall stockings; year-round Savage/NBP	Sulphur, Caddis, attractors, Midge
Brook Trout	Native	6–12 in	Big Hunting Creek (Catoctin Park), Casselman headwaters, Garrett County tribs	April–early July; Sept–Oct	Caddis, Sulphur, attractors

Know the species, then go find them.

Maryland River Conditions →Maryland Fishing Regulations