This photo needs editing.
Difficulty IV-V
Length 0 Miles
Gauge Yaak River near Troy MT
Flow Range 1250 - 1900 CFS
Flow Rate as of: 1 day ago 565 [CFS]
Reach Info Last Updated 03/21/2016 4:19 pm

River Description

Boulder Creek is a too-often overlooked steep creek that enters the Kootenai River at the Montana/Idaho Border.  The creek boasts one of the best 20-30 foot waterfalls in the region, Magnolia Falls. 

Warm up rapids lead to a double ledge drop called Red Lobster, more rapids lead to a tricky waterfall called Grunge Poser, and still more rapids lead to a walled-in gorge that culminates in an unrunnable waterfall.  Portage the gorge on river left following a small drainage, and do your homework so you know where to take out.  A seal launch or rappel will drop you back into the creek just upstream of the classic Magnolia Falls.  At low and moderate flows the falls offers an autoboof flake, but at high water you have to be a bit more creative to avoid a trip behind the curtain.  If you walk magnolia be prepared for a short rappel on river left. Immediately below Magnolia Falls is a drop often portaged and them some more fun rapids before you reach the Kootenai River. 

Access is via road from either Troy, MT or Bonners Ferry, ID, but the shuttle is extremely long around to the far side of the Kootenai River.  There appears to be no public access to the Kootenai River in the vicinity of the confluence with Boulder Creek.   Paddlers have hiked back upstream high on Boulder's river right to an access road that parallels the gorge, while others have set a shuttle far downstream on the Kootenai. A good option is to paddle just a couple hundred yards down the Kootenai and then hike up to the left to connect with a trail/road that leads up to the shuttle road at its closest point to the River in that area.

**Due to flooding in December, 2015, this run has become much more dangerous. Numerous log chokes and fresh debris has created an unstable river bed that presents boating hazards. It's advisable to get local information before attempting this run.**

Boulder can be done in concert with the nearby Yaak River, Kootenai Falls, the Pack, or you can head north to Boundary and Smith creeks.  Prospect Creek is a nice halfway home run for Missoula paddlers. 

Look for roughly 1250 to 1900 cfs on the Yaak Gage. 

Boulder Creek was threatened by a hydropower proposal in 2010 that would have dewatered it. American Whitewater fought the proposal, and the proposal failed.  

Rapid Descriptions


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Fremont Shields
7 years ago

We boated this when the Yaak was at 6.1' or about 2,600. In between drops were fun, but the highlight bigger drops looked very intimidating. Also the ferry below Magnolia gets hairy. We opted for a longer portage instead of the ferry. IMO, this is a run best done with someone who's done it before and knows the logistics...don't miss the portage eddy. It's comes on a right turn only a couple minutes after leaving Grunge Poser.

Gage Descriptions

The best gage to determine if Boulder Creek is flowing is the Yaak River gage near Troy.  A rough estimate would be 1250 to 1900 on the Yaak. 

Directions Description

We have no additional detail on this route. Use the map below to calculate how to arrive to the main town from your zipcode.

No Accident Reports



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Dam Proposal Fails on Boulder Creek (ID)

Kevin Colburn

Last week the Federal government cancelled a permit granting North Hydro, LLC exclusive rights to persue a hydropower development on Idaho's Boulder Creek. The hydro project would have largely dewatered 2 miles of Boulder Creek, an otherwise highly scenic and ecologically valuable whitewater stream.  American Whitewater is pleased to have played a role in successfully defending Boulder Creek from this threat.  

article main photo

AW Seeks Stream Protection in Idaho Panhandle

Kevin Colburn

American Whitewater recently prepared a report on the streams of the Idaho Panhandle that are eligible for Wild and Scenic designation based at least in part on their regionally or nationally significant recreational values. We have asked the Forest Service to find each of these streams eligible for Wild and Scenic designation and thus grant them interim protection.

article main photo

AW Defends Idaho Creek from Proposed Dam

Kevin Colburn

Last month American Whitewater filed a motion to intervene and comments on a new proposal to dam northern Idaho’s Boulder Creek.  Boulder Creek is listed as critical habitat for the federally threatened bull trout, and offers paddlers a high quality steep creek experience.

article main photo

Idaho Proposes Registration Fee for Non-Motorized Boats

John Gangemi

<?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" />Idaho is proposing a $13 registration fee for non-motorized boats greater than 7 feet in length. Under this registration fee proposal all kayaks and rafts on Idaho waters would be required to have a registration sticker fixed to the bow of each boat greater than 7 feet in length. Stickers would not be transferable between boats. Out of state boaters would be required to comply as well.

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Can You Taste Victory?

American Whitewater

FERC revokes Preliminary Permit for
hydropower project on Boundary Creek in
Northern Idaho.

Kevin Colburn


Revision #Revision DateAuthorComment
1198712 11/19/10 Kevin Colburn n/a
1198713 11/19/10 Kevin Colburn new reach
1198715 11/19/10 Kevin Colburn Added Photo
1199885 04/20/11 Kevin Colburn added gage
1205935 03/21/16 Kevin Colburn added 2015 warning.
1199016 12/07/10 Kevin Colburn