Colorado Fishing Reports ยท South Platte Basin
Below Button Rock Dam, the North St. Vrain runs through the Button Rock Preserve, a quiet canyon you reach on foot.
Looking for the latest Below Button Rock 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 North St. Vrain Creek โ Below Button Rock.
Current flows
Wind forecast
Below Button Rock fishing report
Updated November 7, 2026.
The release below Button Rock is about 20 cfs and clear. We have no fresh report, but expect midges and small BWOs. Fish slow and deep in the middle of the day.
Load your fly box
Before you head to Below Button Rock, bring: Zebra Midge #20-22, RS2 Emerger #20-22, Pheasant Tail Nymph #18-20, Parachute Adams #18-22, JuJu Baetis #18-22, Black Beauty #20-24, Egg #14-16, Squirmy Wormie #12-14, Scud Bomb #14-16.
Flies working right now
The flies above that we have in stock right now.
Below Button Rock river details
| Access | Button Rock Preserve, about a 1 mile walk on a road from the trailhead lot west of Lyons. Preserve rules are strict, and pets are not allowed. |
|---|---|
| Elevation | About 6,000 ft |
| Drive from AvidMax | About 67 miles, roughly 1 hour 40 minutes from our Centennial shop |
| Best season | All year |
| Fish | Brown and rainbow trout |
| Regulations | Special restrictions apply. Check Colorado Parks and Wildlife and the preserve rules. A Colorado fishing license is required. |
| Leaders and tippet | 9 ft leaders, 6X tippet |
| Camping | None |
| Kids | Yes. A gentle walk on a road. |
| Good to know | The lot fills on weekends. |
Fishing by season
Winter
Open water with midges.
Spring
Good fishing.
Summer
Caddis.
Fall
BWOs.
How to get there
Take US-36 west of Lyons to County Road 80 and the Button Rock Preserve trailhead.