Troutline

North Fork South Platte River

Colorado·Front Range·39.46° N, 105.36° W
Flow
265 ft³/s
NF South Platte at Bailey
Water Temp
—
Condition
—
Weather
62°F
Mostly Clear
near Aspen Park

The North Fork is the small, brushy water most Front Range anglers drive past on the way to Cheesman or Deckers, and that's the appeal. It runs about 30 miles roughly west to east down US-285 from near Grant through Bailey, Pine Junction, and Buffalo Creek before joining the mainstem South Platte at the town of South Platte. What makes it fish more like a tailwater than its size suggests is the Roberts Tunnel: Denver Water's 23-mile trans-basin diversion from Dillon Reservoir surfaces into the river near Grant, and when it's running it props flows up and evens out the freestone's natural swings. The fish are mostly wild browns and rainbows with cutbows mixed in, running smaller than the tailwater trout downstream — a good day is 10- to 14-inch fish with the occasional better one, plus genuinely large trout on the private leases.

This is tight, technical, wade-only water: shallow riffles, quick seams, and pocket water broken up by occasional deep holes and undercut banks. The gin-clear flows and heavy streamside brush reward short-line nymphing over long drifts. Standard sight-nymphing works day to day, and 6X tippet on the dropper is normal with size 22-24 midges in winter. Midges carry the cold months, Baetis bracket spring and fall, caddis and stoneflies fill summer, and morning Tricos are a July-August staple. Feeding windows are more forgiving than on Cheesman, and midday is prime once the canyon warms and light reaches the water. Best flows run roughly 150-250 CFS, with 200 close to ideal; it gets pushy and off-color during spring runoff from late May into June, and skinny by late summer if the tunnel throttles back.

The catch is access. A lot of the best water — the three-mile Boxwood Gulch / Long Meadow stretch between Bailey and Grant, and Blue Quill's Shawnee Meadows and Rawhide leases — is private trophy water you pay to fish. Public water is limited but real: Pine Valley Ranch Park (Jefferson County Open Space) south of Pine Junction is the reliable free stretch, with more scattered public access toward the confluence. It's an hour from Denver, lightly pressured compared to the marquee South Platte canyons, and a solid cold-weather option when you want moving water without a crowd. The mining legacy upstream means bug life and fish size lag the mainstem — an honest trade-off for the quiet.

Species

  • Brown Trout
    Primary · Sep-Nov · 8-16"

    The dominant wild species. Public-water browns run small; the larger fish (18-20"+) concentrate on the private leases between Bailey and Grant. Pre-spawn fall is the best window for a better brown.

  • Rainbow Trout
    Common · Jun-Oct · 8-14"

    Wild with some holdover. Smaller and less plentiful than the mainstem South Platte fish downstream.

  • Cutbow Trout
    Limited · Jun-Oct · 10-15"

    Rainbow-cutthroat crosses turn up in the system, mixed in with the rainbows.

  • Brook Trout
    Limited · Jul-Sep · 6-10"

    Small numbers in the colder upper reaches and tributaries near Grant. Not a target fish.

Ideal wading flow150–250 CFS
Blow-out>300 CFS
Ideal water temp48–60°F

Winter and early spring (Nov-Mar) is the quiet-water sweet spot — midges, low pressure, forgiving midday windows. Fall (Sep-Oct) for BWOs, Tricos, and pre-spawn browns. Summer (Jul-Aug) fishes well on Tricos, caddis, and terrestrials when flows are in range. Spring runoff (late May-Jun) is the weak window — high, off-color water.

Sections

3 sections on this river

Grant to Bailey (Upper)

WadeBrown Trout · Rainbow Trout

Small freestone with pocket water, riffles, and meadow runs. Flows are augmented and steadied when the Roberts Tunnel near Grant is discharging Blue River water, which makes the upper river fish like a tailwater. Mostly private — the three-mile Boxwood Gulch / Long Meadow trophy leases and Blue Quill's Shawnee Meadows and Rawhide beats sit in this stretch, with limited public shoulder access along US-285.

Best for: Wild brown trout on the private water, where deep holes hold bigger fish; nymphing and streamers. Hopper-dropper fishes well in the meadow water through late summer.

Pine Valley Ranch to Confluence (Lower)

WadeCutbow · Brown Trout · Rainbow Trout

Riffles, runs, and pocket water dropping through the Pine and Buffalo Creek corridor to the mainstem confluence at the town of South Platte. The most reliably public water on the river: Pine Valley Ranch Park (Jefferson County Open Space, south of Pine Junction) is the anchor, with parking, restrooms, and family-friendly walk-and-wade access, plus more scattered public access continuing downstream.

Best for: Approachable public-water nymphing for wild brown trout, rainbow trout, and cutbow; good water for beginners and DIY anglers.

Bailey to Pine (Middle)

WadeBrown Trout · Rainbow Trout

Tighter canyon water — shallow riffles, quick seams, and pocket water squeezed by streamside brush, broken up by occasional deep holes. Gin clear. Mixed private and public, with scattered public pull-offs along US-285 between Bailey and Pine Junction. This is the river's quiet-winter-water reputation: fewer anglers and forgiving midday feeding windows compared to Cheesman and Deckers.

Best for: Short-line and sight nymphing for wild brown trout and rainbow trout; the classic North Fork technical dry-dropper game. Bring 6X and small midges in the cold months.

Regulations

Current fishing rules and restrictions

Standard statewide Colorado trout regulations on the public water — no special Wild Trout, Gold Medal, or catch-and-release designation like the mainstem's Cheesman Canyon. Private leases set their own catch-and-release rules.

  • Standard statewide trout limit (4 trout daily / 8 in possession) applies on public water unless posted otherwise
  • No river-wide fly-only or artificial-only restriction on the public stretches — bait, lure, and fly all legal under statewide rules
  • Valid Colorado fishing license required (resident/non-resident; annual, 1-day, and multi-day options)
  • Much of the river is private — respect posted boundaries; fish Pine Valley Ranch Park and marked public access, or book guided private-water days

Barbless and catch-and-release are angler-recommended here, not mandated. The private trophy leases (Boxwood Gulch, Long Meadow, Blue Quill's Shawnee Meadows and Rawhide, North Fork Ranch) are pay-to-fish or guided-only, reservation required. Confirm current-year regulations at cpw.state.co.us before your trip.

Source: Colorado Parks & Wildlife. Regulations change annually — verify before fishing.

Access & Logistics

Getting there, fly shops, and lodging

Getting There

Bailey, CO

~1 hr southwest of Denver via US-285; ~1.25-1.5 hr from Denver International Airport

Fly Shops

Camping & Lodging

Pine Valley Ranch Park is day-use only (no camping at the park itself). Jefferson County and Pike National Forest campgrounds sit nearby in the Buffalo Creek recreation area. Lodging in Bailey and Shawnee (North Fork Ranch, The Stillwood Retreat) and in Evergreen and Conifer to the northeast.

Pine Valley Ranch Park (Jefferson County Open Space, south of Pine Junction) is the anchor public access — parking, restrooms, family-friendly walk-and-wade. More scattered public access continues downstream toward the confluence. Much of the upper and middle river is private; watch for posted boundaries along US-285.

Conditions data is live from public monitoring networks. Regulations change annually — always verify current rules with your state fish & wildlife agency before fishing.

More in Colorado

View all 24 rivers

Front Range

Big Thompson RiverCO

The Front Range's most accessible wild-trout tailwater — a road-side canyon of pocket water and plunge pools below Lake Estes, holding wild browns and rainbows on technical dry-dropper and tight-line nymphing water.

Cache la Poudre RiverCO

Colorado's only Wild & Scenic river and a classic Front Range freestone — fast, boulder-strewn pocket water tumbling down the Poudre Canyon along Highway 14, 30 minutes from Fort Collins. Wild browns dominate the canyon, with rainbows, cuttbows, and brookies mixed in; fish run modest (8-14") but the roadside access to a genuine wild-trout canyon is the draw. Snowmelt-driven, so it blows out late May into June, then drops into dry-dropper shape from July on.

Clear CreekCO

The I-70 corridor freestone Denver fishes on a weeknight — tight, brushy roadside pocket water from Georgetown through Idaho Springs and Clear Creek Canyon to Golden, holding aggressive wild browns and stocked rainbows.

South Platte RiverCO

Colorado's most-fished trout river — three Gold Medal tailwaters within ninety minutes of Denver. Cheesman Canyon and Deckers below Cheesman Reservoir, and the 'Dream Stream' between Spinney Mountain and Elevenmile reservoirs in South Park, are the destination water.

Other regions

Animas RiverCO

A big San Juan freestone that runs Gold Medal water through downtown Durango — wide boulder pocket water holding wild browns and rainbows, best on weighted nymphs and sculpin streamers once June snowmelt drops out.

Arkansas RiverCO

102 miles of Gold Medal water from Leadville to Parkdale — Colorado's longest continuous Gold Medal stretch. A high-elevation freestone with strong caddis hatches, a stout summer guide industry, and excellent walk-and-wade access along Highway 24 and Highway 50.

Blue RiverCO

Summit County tailwater below Dillon Reservoir through Silverthorne, then a longer reach below Green Mountain Reservoir down to its confluence with the Colorado. The Outlets Mall stretch in Silverthorne is the most-fished stretch — urban, accessible, and selective. Below Green Mountain offers bigger drift-boat water with strong wild brown trout populations.

Colorado RiverCO

The Colorado's upper reaches in Grand County and through Middle Park — from headwaters at La Poudre Pass through Hot Sulphur Springs, Kremmling, Pumphouse, Radium, and on through Glenwood Canyon. Gold Medal water below Williams Fork at Pumphouse-Radium float with strong wild brown trout populations.

Conejos RiverCO

A long, quiet San Luis Valley freestone that falls out of the South San Juan Wilderness through a black rhyolite gorge below Platoro Reservoir — wild browns and rainbows, more stonefly species than any river in Colorado, and miles of Highway 17 pocket water most anglers drive past on their way to the Rio Grande.

Crystal RiverCO

Free-flowing freestone that runs undammed from the marble quarries above Marble down past Redstone to the Roaring Fork at Carbondale. Wild browns and rainbows plus native whitefish in a wade-only pocket-water fishery that fishes on the snowpack's schedule — blown out through June, then clear and fishable July into fall.