Fly fishing report · West

South Fork South Platte Below Antero

A South Park planning page for the South Fork South Platte below Antero Reservoir, centered on the Badger Basin and Knight-Imler public easements, artificial-only rules, and careful wind-and-wading judgment near Hartsel.

Check flow & weather

Today's river scoreMedium source confidence

Caution

Best option: Float.

A float can fit better than wading only if launches, shuttle, boat skill, wind, and local rules all check out.

Updated Jul 23, 2:36 AM UTCLive sources checked regularly

Recommended approachFloat

Mode scores adjust the river-wide score for the risks of wading, bank fishing, or floating.

Wade19/100

Wading is the most sensitive plan today. Use protected edges only, avoid crossings, and downgrade quickly if clarity or current feels wrong.

Bank / edgeCheck

This report does not describe this as a primary mode. Verify legal access, depth, launches, and retreat options before planning around it.

Float · Best fit45/100

A float can fit better than wading only if launches, shuttle, boat skill, wind, and local rules all check out.

Confirm before you leave

Flow and weather right now.

Use the flow trend to confirm the score before you leave. Weather can change the safest and most productive fishing window.

River strategy

Fish this reach like a narrow public corridor, not a wide-open South Park free-for-all.

The South Fork below Antero is most useful when flows are stable enough to leave distinct seams, the wind is manageable, and you respect how limited the legal access footprint can be. The better days come from working posted easement water carefully instead of wandering the valley and guessing where public fishing begins.

Use RiverReports for the below-Antero trend, then compare that picture with what the Badger Basin and Knight-Imler access rules will actually let you fish safely.
Colorado's special regulations for the South Fork upstream to Antero and again below Badger Basin keep this reach firmly in artificial-only, trout-protective territory.
Badger Basin SWA is fishing-only, requires designated parking, and limits use to the fenced and posted easement.
Knight-Imler is even tighter: public access is limited to within 25 feet of the stream centerline, so map discipline matters as much as fly selection.

Why this score moved

FlowUse caution

RiverReports is linked for the flow chart, but this page does not have a structured live flow value the score can read automatically. Treat the rating as conservative and open the chart before committing.

Short-term weatherUse caution

The forecast has storm or heavy-precipitation risk, so timing and access matter more than the score alone.

Best mode nowUse caution

Float: A float can fit better than wading only if launches, shuttle, boat skill, wind, and local rules all check out.

SeasonHelps score

Summer: Good on cooler mornings and stable-release days, but midday wind can narrow the best window quickly.

WeatherHelps score

The NWS forecast is about 67F with Chance Showers And Thunderstorms.

Read the water

What changes the plan.

This is usually a shoulder-season through fall wading plan for anglers who want technical meadow-river trout water without the broader crowds of Deckers. Wind, spring runoff, and ambiguous property lines all reduce the value of forcing a full-day commitment.

Stable moderate flow

Best for reading cutbanks, soft seams, and short drifts without forcing long crossings.

Low clear flow

Fish small flies, longer leaders, and a very low profile because the meadow setting exposes every mistake.

Runoff or dam-change push

Treat the reach as a scouting stop or skip it rather than gambling on soft edges that are no longer really fishable.

Strong South Park wind

Shorten leaders, simplify rigs, and expect the open valley to erase much of the delicate presentation advantage this reach usually rewards.

Field plan

Fish it with intention.

Best flows

Stable moderate flows that keep cutbanks, riffle edges, and meadow seams distinct without erasing the softer holding water.

When to skip

Skip when South Park wind overwhelms presentation, when runoff or release changes bury the banks, or when you cannot confirm the easement you plan to use.

Local plan

Start with one CPW access point, fish the best bank structure close to the legal corridor, and keep a canyon backup ready if wind or water shape turns against you.

Backup water

If this reach gets too windy or vague on access, pivot to Eleven Mile Canyon or the broader Deckers South Platte corridor.

Hatches & flies

Bring a flexible box.

TimingWhat to watchUseful flies

SpringMidges, BWOs, and early caddisBlack beauty, RS2, BWO emerger, caddis pupa

Reviewed pattern · report says “Black beauty”Black Beauty MidgeA very slim black thread body, fine silver rib, and small dark thorax define the core Black Beauty. Glass-bead Mercury Black Beauty and flash-wing variants must stay labeled separately.See photos & how to fish it

Reviewed pattern · report says “RS2”RS2Start with the beadless architecture: two dark-dun Microfibett tails separated behind a slim, tightly twisted and visibly segmented dubbed abdomen; a fuller thorax; and saddle-hackle web clipped into a short angled wing bud. Rim Chung's original-style form uses natural beaver dubbing and hackle web. CDC- or Antron-wing ties, beads, curved hooks, flash, and tailless Avatar-style flies must remain labeled variations.See photos & how to fish it + 2 more reviewed guides in the Fly Box

SummerPMDs, caddis, yellow sallies, and terrestrialsPMD cripple, elk hair caddis, yellow stimulator, ant

Reviewed family · report says “PMD cripple”Pale Morning Dun PatternsPMD names an insect group, not one fly. Pale nymphs, trailing-shuck emergers, upright or low-riding duns, cripples, and spent-wing spinners stay visibly separate.See family guide

Reviewed pattern · report says “elk hair caddis”Elk Hair CaddisLook for a tented elk- or deer-hair wing, clipped hair head, dubbed body, rib, and hackle palmered along the body. The body color should be labeled because tiers often match different natural caddis colors.See photos & how to fish it + 2 more reviewed guides in the Fly Box

Late summerHoppers, beetles, and evening caddisFoam hopper, beetle, ant, soft hackle

Reviewed family · report says “Foam hopper”Grasshopper PatternsHopper patterns share a substantial body and long rear-leg impression, but foam, deer hair, wing construction, and waterline differ widely among named patterns.See family guide

Reviewed family · report says “beetle”Beetle PatternsBeetle flies range from simple foam shells to hair-bodied and sunken forms. A rounded back and compact profile distinguish the family from ants and hoppers.See family guide + 2 more reviewed guides in the Fly Box

FallBWOs, midges, and streamer windowsParachute BWO, RS2, zebra midge, small olive bugger

Reviewed family · report says “Parachute BWO”Blue-Winged Olive PatternsBWO describes a hatch group, not one fly. Nymph, emerger, dry, cripple, and spinner profiles must stay separate because they occupy different parts of the water column.See family guide

Park only where the easement or SWA rules clearly allow it, then fish one legal corridor thoroughly before moving.

Use wind direction to choose banks that let you control the first drift instead of fighting the whole valley.

Stay bank-focused because the best trout lies are often close to undercut structure and because property limits make long wandering sessions less productive.

If flows or wind remove your ability to fish precise short lanes, move to another South Park option rather than forcing sloppy presentations.

Access & responsibility

Know the entry. Know the exit.

Colorado special regulations on the South Fork South Platte in Park County are protective and reach-specific. Artificial flies and lures only apply on the below-Antero and lower South Fork sections, and trout return and size-limit rules change by subsection. Check the current Colorado special-regulations page before fishing.

Badger Basin SWA

The main below-Antero public fishing anchor with fenced and posted easement access and designated parking only.

Knight-Imler SWA fishing easement

A narrower public easement where access is limited to within 25 feet of the stream centerline.

Hartsel corridor staging

Useful for supplies and weather decisions before you commit to the open South Park valley.

Recent reach reports

What anglers are seeing.

Moderated, river-level updates for South Fork South Platte Below Antero. Exact spots, private access notes, and private media never appear here.

Submit a reach report Open in BSF

No verified reach reports yet.

Be the first to share a generalized river update through the moderated BSF app flow.

Transparent sources

Check the facts behind the plan.

Last material review: 2026-05-31

Active maintenance check: Jul 14, 2026. BlueStreamFly checks report sources, links, live fishability inputs, and page rendering on a recurring maintenance schedule. This check does not change the material review date unless public guidance or sources changed.

flowRiverReports: South Fork South Platte below Antero regulationColorado special regulations: South Fork South Platte accessColorado Parks and Wildlife: Badger Basin SWA accessColorado Parks and Wildlife: Knight-Imler SWA fishing easement accessColorado Parks and Wildlife: Antero State Trust Land safetyNational Weather Service forecast point near Hartsel

Common questions

Before you leave.

Is this the same as the Deckers South Platte?+

No. This page is for the South Fork South Platte below Antero in South Park, not the Deckers and Cheesman corridor farther downstream.

What access should I trust first?+

Start with the CPW Badger Basin and Knight-Imler pages because they describe the public easements and parking limits that matter most here.

When should I skip this reach?+

Skip when strong wind ruins line control, when flows remove the softer meadow seams, or when you are unsure about the easement boundaries you plan to fish.