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 10/02/26
Water temp is sitting at 55.4°F on the spring creeks this week — right at the sweet spot where BWOs fire reliably and Mahogany Duns start showing in numbers. Flows are steady as expected on these spring-fed systems, which means clear water and technical presentations. No fresh shop reports this week, so this outlook is built on current conditions and seasonal patterns. Pre-spawn browns are holding in the flats and along weed edges, and they're keyed in on emergers and cripples more than perfect dries. Plan your day around midday windows: BWO emergence on these spring creeks runs roughly 11am–2pm, especially on the cooler, overcast stretches that the forecast could deliver. Carry RS2s and BWO Cripples in #18–20 as your first reach — fish will be more selective on emergers than fully-winged adults. Scuds remain a reliable subsurface anchor all day, and don't overlook midges on a Zebra Midge or WD-40 as a dropper. With highs nudging near 80°F by Sunday and 17mph wind, early-week calmer conditions (Saturday looks best at 6.5mph) may offer the cleanest dry fly presentations.
- Flow: Flows at 1,280 cfs — stable and clear as expected on these spring-fed creeks. Consistent currents mean weed edges and flat tails are holding fish.
- Hatches: BWOs and Mahogany Duns are peak-month bugs right now. Expect emergence 11am–2pm. RS2, BWO Cripple #18–20 and Sparkle Dun are the go-to choices.
- Water Temp: 55.4°F is prime fall territory — Mahogany Duns crossing the 55°F threshold, BWOs firing strong, and pre-spawn browns actively feeding through midday.
- Best Window: 11am–2pm for dry fly and emerger action. Saturday's low wind (6.5mph) sets up the cleanest presentations. Sunday's 17mph gusts will make sight-fishing tough.
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 →
Nearby Waters
Closest Waters
More in This Region
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.
Open the live forecast for today's numbers and the 7-day outlook, or download the iOS app to carry it with you on the water.