| Difficulty | III-IV+ |
| Length | 1.9 mi |
| Avg Gradient | n/a |
| Gauge | Snake River Nr Twin Falls Id |
| Flow Rate as of 1 hour | 2020 cfsmedium runnable |
| Reach Info Last Updated | July 24, 2026 |
A year-round, half-day option for paddling near Twin Falls Idaho. This short run is friendly III-IV at low water, but gets much harder as flows increase.
Locally known as the Sewer Run.
The shuttle is the primary challenge here. The take-out road on the north side washed out in 2017. The Yingst grade is now only used for foot and bike traffic.
Sewer Run has 4 rapids. It can be run at minimum flow but is very rocky. The rapids become powerful and pushy around 4,000 cfs and the broken bridge shortly above Auger Falls becomes a hazard to rafts. Water blasts multiple feet deep over the bridge at 20,000 cfs. The guard rails (possibly removable) and ramp added in 2024 will add to this already significant strainer hazard at moderate to high flows. The bridge was destroyed by high water decades ago.
There is no public driving access to take out at broken bridge. You must hike back to the put-in or team up with locals who have gate access.
Below broken bridge, there is a calm pool with plenty of recovery time before Auger Falls. At high flows, a large surf wave is rumored to exist here.
Auger Falls has been run multiple times at very low flows, you'll probably want less than 1,000 cfs to give it a try. It features 4 main drops. #2 is the most technical due to a rock fall in recent years. Running Auger leaves you with a 1.5 mile hike back to the mountain bike trailhead parking area. At low water all the individual drops in Auger can be sorted out at river-level, but it can also be scouted from the trails running through the adjacent park.
There is great potential for this whitewater run. Auger Falls park is owned by the city of Twin Falls. Adding parking near broken bridge and allowing access would be a significant gain for tourism and the whitewater community.
The put in is a small road side pull out with a short trail to the river. Paddlers can use upstream or downstream pull outs to their liking.
Walk up the ravine to the trail system below the last rapid in Auger Falls. Do not make the mistake of continuing to the open pool downstream where the road meets the river or you will find yourself behind a large fence and trespassing. From the ravine it is about a 1.5 mile hike back to the parking lot along trails and a gated road.
At low water this rapid is easy, at high flows it is hazardous as the bridge itself becomes a hazard. Paddlers not running Auger Falls can begin their hike out here.
Auger Falls is a 4 part rapid that can be run at low water (below 1,000 cfs), quickly becomes class V and beyond as flows increase. It can be scouted from the trails in the adjacent park.
Oct 8, 2024
We were passing through along I84 and made another run of this section at a little under 600 cfs. This time we tried paddling all the way to the logical take out at the downstream end of the park, this was a mistake as the area is fenced in and we had to get creative to get back into the area open to the public. Avoid this by taking out before the river opens up into a large pool below the rapids.
It would be really cool if there were vehicle access to the take out for this run, but we still thought it was worth the hike. Level was good for the Auger drops, boney but still fine for kayaks/packrafts in the boulder gardens above.
Nov 6, 2022
11/06/2022
A fun quick run near Twin Falls. 430 cfs was low for the boulder gardens in the first part of the run, but everything went with minimal boat abuse. This was a clean level throughout the Auger Falls drops, which we found fun and unique at these low flows. The hike out was straight forward along biking trails and a gravel road.