Montana Fishing Reports ยท Central Region
Big Spring Creek flows from one of the largest freshwater springs in the country through Lewistown, a constant-temperature creek with browns and rainbows year-round.
Looking for the latest Big Spring Creek river report? This page is updated by the AvidMax fly shop team with live flows, current conditions, hatches and the flies working now on the Big Spring Creek โ Lewistown.
Current flows
Wind forecast
Big Spring Creek fishing report
Updated November 7, 2026.
The gauge near Lewistown reads around 150 cfs, clear and steady, as usual.
Spring creeks fish all winter. Scuds, sow bugs and small midges, plus BWO dries on cloudy afternoons.
Load your fly box
Before you head to Lewistown, bring: Kaufmann', s Scud #14-16, Zebra Midge #18-20, JuJu Baetis #18-20, Parachute Adams #18-20, Pheasant Tail Nymph #16-18, RS2 Emerger #18-22, Black Beauty #20-24, Egg #14-16, Squirmy Wormie #12-14.
Flies working right now
The flies above that we have in stock right now.
Big Spring Creek details
| Access | Fishing access sites and city parks along the creek in and around Lewistown. |
|---|---|
| Elevation | About 3,900 ft |
| Nearest town | Lewistown, Montana |
| Best season | Year-round |
| Fish | Rainbow and brown trout |
| Regulations | Montana's stream regulations vary by district and river. Check Montana Fish, Wildlife and Parks regulations for the current rules. A Montana fishing license is required for anglers 12 and older. |
| Leaders and tippet | 9 to 12 ft leaders, 5X to 6X tippet |
| Camping | Camping near Lewistown |
| Kids | Yes. Easy town access. |
| Good to know | Steady flows make it a good winter option. |
Fishing by season
Winter
Steady and fishable.
Spring
BWOs.
Summer
PMDs, caddis and hoppers.
Fall
BWOs and browns.
How to get there
From Great Falls, take US-87 east to Lewistown.