American, North Fork

4. Yankee Jims Road Bridge to Lake Clementine(Shirttail/Ponderosa)

Reach banner
DifficultyII-III
Length9 mi
Avg Gradientn/a
GaugeNf American R a North Fork Dam Ca
Flow Rate as of 1 hour
430 cfsbelow recommended
Reach Info Last UpdatedJune 5, 2025

River Description

This section goes by several names - Ponderosa, Shirttail, and sometimes just 'The North Fork from Yankee Jim down'. A couple of takeout options allow you to choose between about 5 miles on the water to Ponderosa Road Bridge and a longer 9 miles or so to Upper Lake Clementine River Access. It is excellent on a warm, sunny spring day on snowmelt and also often runs in the winter. Upper Clementine is typically subject to seasonal closure so taking out is preferred in the winter/early spring. Rapids are generally Class II between about 800 and 1600cfs. At these flows the most significant features appear in the longer braided rapid visible from Yankee Jim's Road and an excellent and short first-time-boating run can be had between Ponderosa Bridge and Upper Clementine. Above 1500cfs, a few rapids can become a little bit more chaotic. Around 3,000cfs a few holes appear on the run that deserve prudent caution with one notable one appearing about 3 bends below Ponderosa Bridge.

In 2022 the Ponderosa Road Bridge replacement project necesitated road grading and the takeout road was considerably improved and smooth as of May 2024.

Put-in: Colfax-Foresthill Rd.

Take-out: Ponderosa Way Bridge (4.5mi) or Upper Lake Clementine Road (9mi)

CAMPING: As of 2015, camping is allowed only from 2000’ downstream of Ponderosa Bridge to 1 mile downstream of Codfish Creek. A campfire permit and/or a camp stove permit will be required too.  Also, while they transition into this new policy it would be best to contact and pick up your permits at the Auburn State Recreation Area office.

Other information sources:


River Features

Yankee Jim's Bridge

Distance: 0 mi

Ponderosa Way (take-out)

Distance: 4.48 mi
Access Point
Ponderosa Way (take-out)

This bridge is probably the most commonly used take out for this section because the river gets considerably easier downstream.

Upper Lake Clementine Beach

Distance: 9 mi
Take Out

This is a fantastic, beautiful run, and at 2500 the river was powerful, with some large holes and definitely a class III feel. I'd be excited to do it again.

Dup Crosson
Dup Crosson

Apr 27, 2019


Such a beautiful run. Great one for beginner/intermediate paddlers. Got to watch a bobcat across a feeder creek for a full 20min on the way out.