Paradise Valley Spring Creeks
Armstrong's · DePuy's · Nelson's
SW Montana, USA
Open live forecast →Target species: Brown and Rainbow.
Stream gauge: 06191500. Flow and water temperature update on every refresh.
Weekly AI Outlook as of 07/31/26
Water temps on the spring creeks are running at 68°F as of this morning — that's well above the curated 56-62°F baseline these tailwater-like spring creeks typically hold through summer, and it's a number that demands attention. The Yellowstone itself is under Hoot Owl restrictions (no fishing 2pm-midnight per MFWP), and while Armstrong's, DePuy's, and Nelson's are spring-fed and somewhat insulated, 68°F is thermal stress territory — fish are lethargic midday and feeding windows are compressing. With highs forecast to hit 95°F on Saturday before a meaningful cooldown Sunday into Monday, the next 48 hours are the most critical. Fish hard before 9am and again after the evening shadow hits the creek. Trico spinners are the morning move — #22-24 Hi-Vis or CDC Trico on the flat tailouts before 8am. Midday, switch to subsurface scuds and midges. Terrestrials — black ant #18, beetle #16 — are your best surface bet during the cooler hours, especially tight to grassy banks. Avoid fishing the warmest part of the afternoon entirely until temps drop back under 65°F.
- Flow: Spring creeks running stable as expected, but water temp is gauging 68°F — well above normal summer baseline. Yellowstone mainstem under Hoot Owl restrictions.
- Hatches: Trico spinners peak before 8am (#22-26). Terrestrials — black ant #18, beetle #16 — are the prime surface option through cooler morning/evening windows.
- Water Temp: 68°F is thermal stress level for trout. Fish are feeding short windows. Watch for continued elevation with 95°F forecast Saturday; Sunday cooldown may offer relief.
- Best Window: Dawn to 9am is essential — Trico and early terrestrial action. Avoid 11am-6pm entirely this weekend. Evening shade fishing resumes after 7pm if temps allow.
Generated weekly from live USGS gauge readings, weather forecasts, and recent fly shop reports. Updates Friday mornings.
About this Water
- Spring Creek
- Best months: Year-round; peak Apr–May (BWO) & Oct (fall hatches)
Three legendary spring creeks — Armstrong's, DePuy's, and Nelson's — flow parallel to the Yellowstone River through Paradise Valley south of Livingston. These private, fee-access fisheries are among the most technically demanding and prestigious trout streams in North America. Spring-fed at constant temperatures, they produce extraordinary populations of large, selective brown trout feeding on dense hatches of midges, BWOs, and PMDs throughout the year. Reservation systems, access fees, and rod limits maintain an exclusive and pristine environment.
A single day's fishing on all three Paradise Valley spring creeks — achievable with careful scheduling — is one of the most coveted experiences in American fly fishing, representing the full spectrum of spring creek technique.
January Outlook
Winter midging on the spring creeks is among Montana's finest. Constant spring-fed flows maintain temperatures in the 46-50°F range — warmer than most Montana rivers. Midges are the dominant hatch and fish feed throughout mild winter days.
Productive Patterns
- Harrop Hanging Midge
- Zebra Midge
- Griffith's Gnat
- RS2
Tips
6X-7X tippet is essential. Approach the fish from below and look for subtle surface rings. A 3 or 4-weight rod with delicate presentation is the right tool. Reservations required — book weeks in advance even in winter.
Water Notes
Rock-steady spring-fed flows (20-50 cfs per creek). Constant temperature 46-52°F year-round. Some creeks fish by appointment only.
February Outlook
Midges remain dominant but BWO nymphs are increasingly effective. The winter spring creek experience is intimate and technical. Brown trout in the 18-24 inch range are the primary quarry.
Productive Patterns
- Zebra Midge
- CDC Midge Emerger
- BWO Nymph
- Scud
Tips
The spring creeks fish best in winter when larger rivers are blown out. Reservation availability improves in February. Bring multiple midge patterns in sizes 20-24.
Water Notes
Constant spring-fed flows. Water 46-52°F year-round. No runoff influence.
March Outlook
BWO hatches begin on warm afternoons. Early Baetis emergers bring fish to the surface consistently. The transition from midge to mayfly is one of spring creek fishing's great pleasures.
Productive Patterns
- BWO Parachute #18-20
- CDC Dun
- Harrop Midge
- Scud #14
Tips
March BWO hatches on spring creeks are the most reliable in Montana. Position below a feeding lane and present systematically to visible fish. A 3-weight rod with 6X tippet is ideal.
Water Notes
Constant flows. Water 48-54°F. Remarkably stable conditions for BWO hatch.
April Outlook
BWO hatches are excellent throughout April. The spring creeks are at their spring-fishing best — perfect weather, consistent hatches, and fish that have seen minimal pressure since fall.
Productive Patterns
- Sparkle Dun (BWO)
- CDC Dun
- Parachute Adams #18
- Baetis Emerger
Tips
April is the most sought-after month — book spring creek access well in advance. Fish the slow flats where large trout rise rhythmically to BWOs. Presentation is everything.
Water Notes
Constant flows. Water 50-56°F. April is peak BWO month on the spring creeks.
May Outlook
PMDs arrive and the spring creeks reach their peak hatch diversity. PMD, BWO, Trico, and Baetis hatches overlap. The most technical and rewarding fishing of the year.
Productive Patterns
- PMD Cripple
- PMD Sparkle Dun
- BWO Parachute
- Trico Spinner (late May)
Tips
May requires pattern matching for multiple simultaneous hatches. Observe what fish are taking before selecting a fly. Multiple rod setups covering different sizes are helpful.
Water Notes
Constant flows. Water 52-58°F. Spring perfection.
June Outlook
Trico hatches and summer transitions. PMDs continue and the first Pale Evening Duns appear. The spring creeks fish all day in June with multiple hatch windows.
Productive Patterns
- Trico Spinner #20-22
- PMD Cripple
- Pale Evening Dun
- Caddis
Tips
The early Trico spinners are the most demanding presentation — fish take them in pods on calm surfaces with no room for error. 7X tippet for Trico presentations.
Water Notes
Constant flows. Water 54-60°F.
July Outlook
Terrestrial season on the spring creeks. Ants, beetles, and hoppers bring the largest fish to the surface. Trico mornings continue to be exceptional.
Productive Patterns
- Flying Ant
- Beetle
- Trico Spinner
- Parachute Hopper
Tips
July is the terrestrial specialist's paradise. Large fish that refuse conventional hatches eat ants with confidence. A size 18 black ant under a grassy overhang consistently takes the biggest fish.
Water Notes
Constant flows. Water 56-62°F. Stable spring-fed conditions throughout summer.
August Outlook
Prime terrestrial month. Hoppers, beetles, and ants bring large browns to the surface throughout the day. Trico spinner falls at dawn are extraordinary.
Productive Patterns
- Trico Spinner
- Parachute Ant
- Beetle
- Foam Hopper
Tips
The Trico spinner fall at first light is a religious experience on the spring creeks. Fish take spinners with total confidence before revising to terrestrials through the day. The fall season approaches.
Water Notes
Constant flows. Water 58-64°F. The most visitor-friendly month.
September Outlook
Fall fishing excellence. Cooling temperatures, fewer tourists, and aggressive fish. BWO hatches return. September on the spring creeks is among Montana's finest experiences.
Productive Patterns
- Blue Winged Olive
- Trico Spinner
- Hopper
- Streamer (late September)
Tips
September post-Labor Day sees dramatically reduced pressure and highly receptive fish. BWOs return in full force in the afternoons. Larger fish become available on streamers as temperatures drop.
Water Notes
Constant flows. Water 54-60°F. The best overall fishing conditions of the year.
October Outlook
Exceptional fall fishing. BWO and Mahogany Dun hatches drive fantastic dry fly action. Pre-spawn brown trout are aggressive. October is arguably the best month.
Productive Patterns
- Blue Winged Olive
- Mahogany Dun
- Streamer
- Trico Spinner (early month)
Tips
October BWO and Mahogany Dun hatches on the spring creeks are legendary. Fish in full spawning colors are aggressive and beautiful. Book this month early — it fills quickly.
Water Notes
Constant flows. Water 48-56°F. Peak fall fishing.
November Outlook
Winter transition. Midges return as the dominant hatch. Brown trout spawning activity — give spawning fish space and respect the redds.
Productive Patterns
- Zebra Midge
- RS2
- CDC Midge Cluster
- BWO Nymph
Tips
November marks the end of the main season on some creeks. Check with individual spring creek operators for season-end dates. Midge fishing is excellent on mild days.
Water Notes
Constant flows. Water 46-52°F. Winter approaching.
December Outlook
Winter midge fishing on the spring creeks is exceptional by Montana standards. Warm spring-fed water and consistent midge activity make this a year-round fishery.
Productive Patterns
- Harrop Hanging Midge
- Zebra Midge
- RS2
- CDC Cluster Midge
Tips
December reservations are easy to obtain. The quiet winter fishing on these famous creeks is a special experience. Fish 11am–3pm on mild days.
Water Notes
Constant flows. Water 46-50°F. Year-round spring-fed fishery.
Hatch Calendar
| Insect | Peak | Active | Size | Productive Patterns |
|---|---|---|---|---|
| Midge Chironomidae |
Jan, Feb, Mar, Nov, Dec | Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec | #20–26 |
|
| Blue Winged Olive Baetis tricaudatus |
Apr, Oct | Mar, Apr, May, Sep, Oct, Nov | #18–22 |
|
| Pale Morning Dun Ephemerella inermis |
Jun, Jul, Aug | May, Jun, Jul, Aug, Sep | #16–18 |
|
| Sulphur Ephemerella excrucians |
Jul | Jun, Jul, Aug | #16–18 |
|
| Trico Tricorythodes spp. |
Aug | Jul, Aug, Sep | #22–26 |
|
| Caddis Hydropsyche / Brachycentrus spp. |
Jun, Jul | May, Jun, Jul, Aug, Sep | #16–20 |
|
| Scud Gammarus / Hyalella |
Mar, Apr, May, Nov, Dec | Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec | #16–20 |
|
Access & Approach
Located south of Livingston, MT on the east side of the Yellowstone. Each creek has its own reservation system with daily rod fees ($50-$150+ depending on creek and season). Book months in advance for peak periods. Wading only — no boats. 3-4 weight rods with 6X-7X tippet are standard.
Nearby Fly Shops
- Fly Fish Montana
- Dan Bailey's
- Yellowstone Angler
- Sweetwater Fly Shop
- Bozeman Fly Supply
- Montana Angler
Regulations & License
Fishing in Montana requires a current license. Always verify season dates, bag limits, and any special-regulation waters before you fish.
Montana fishing regulations & license →
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About Current
Paradise Valley Spring Creeks conditions on Current combine real-time flow data (USGS, WSC, CDEC, CEHQ), weather, tide predictions, hatch probabilities calibrated to this specific water, and recent fly shop reports from the area.
Paradise Valley Spring Creeks is one of 245 hand-curated waters in Current. The app and web forecast also generate AI outlooks for any unlisted river, lake, or saltwater flat anywhere in the world — drop a pin or paste a name and Current produces a fresh seasonal outlook with weather, flow context, and recommended techniques.
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