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RiverBrain

American River, North Fork

Generation and Giant Gaps (Tadpole to Colfax-Iowa Hill Road)

California – US

Class
IV to IV+
Length
26.8 Mile(s)
Gradient
120 FPM
Put-in elevation
5,444 Feet
Take-out elevation
2,194 Feet
Typical season
March to July

Current Flow

87 CFS

Gauge height: 0.46 FT

Reading from Jul 10, 2026 9:15 PM

-0.38/hr (12h) -0.19/hr (24h)

Too Low

Don't bother

Primary gauge
NF AMERICAN R A NORTH FORK DAM CA Gauge detail & alternatives Live gauge ↗

Recommended levels

Minimum500
Average1,250
Maximum2,500

Recommended use

  • Kayaking
  • Rafting
  • Canoeing
  • SUP
  • Packrafting
  • Fishing

Struck-through craft are not recommended for this run.

Flow history — last 6 days

Photos

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Description

The gaps are still expert runs but the river has calmed down some (compared to the Royal Gorge).  There is still plenty of class IV and V to be had in here so this run is still for advanced boaters.

Access into the gaps is part of what makes these runs tough.  Both generation and giant runs require trail hikes in and possibly out depending on how far you are going.  Some of the shuttles can take an aweful long time as well.  The Euchre bar access requires a longer shuttle from Tadpole so most boaters typiclly run both gaps together to make logistics easier.

Season on the North Fork is limited to the snowpack runoff so look at spring time or really wet winter weather to catch good flows for this.

Rapids

# Rapid Class Recommended flow Description Scout
1 Tadpole Falls V 500–2,500

This is the main entrance into the gorge that starts Generation Gap.  You have a few options here.  You can run the falls after scouting it.  You can portage this entire mini gorge or you can try to seal launch off the rocks just below the falls and then run the rest of the mini gorge.

Scouting, portaging and safety can all be had on river left bank where the tadpole trail comes into the canyon.

2 Mumford Bar Ledge Rapid IV+ 500–2,500

This tight chute is really rocky, even at higher flows.

Scout or portage left.

3 Slide Rapid IV to IV+ 500–2,500

Another drop with possible hole retention based off of where you choose to drop in.

Scout or portage left.

4 F-14 V- 500–2,500

This is an often portaged rapid.  Not because it can't be run but it has been known to have wood and logs wedged in here. 

Scout, set safety, or walk on river left.

5 Giant Gap Entrance Rapid III+ to IV 500–2,500

After the canyon begins to narrow again and leaves green vally, is a rapid that marks the entrance to Giant Gap.  This is identified by a large boulder with most of the current going to the right.  Immediately below the first boulder is anouther big boulder.  Good idea to scout here due to trees often being stuck here.  At one point there was a tree all the way across the river here with a sneak on the right.

Scout on river right in the eddy just above the rapid.

6 Grater Rapid IV to IV+ 500–2,500

A rocky boulder drop here. Kayaks have more descent options than rafts.

Scout river right just above the rapid.

7 Nutcracker Rapid IV to V- 500–2,500

This rapid gets worse at higher flows.  Follow the drops down between the cliff on the right and the big rock on the left.

Scout and portage on river left.

8 Locomotive Rapid IV+ to V 500–2,500

A large rock protrusion on river right signifies the narrow locomotive drop.  There is a sleeper or lurking rock in the main drop.  You have to decide if you want to run right or left of the rock.

This is a tough area to scout and portage because of the cliffed river channel.

9 Dominator Rapid V 500–2,500

Considered the crux of the run by many.  Depending on flows you need to pick your way down the drops and make it to the right for the final drop.  The final left drops can have retentive holes.

Bouldery portage on river right.

10 Pinball Rapid IV 500–2,500

This is the last big rapid on the Giant Gap stretch.  Just below here is the takeout. This isn't the hardest rapid but after a long day of paddling V's and IV' you still want to treat this rapid with respect.  Pick your zig zag line through the boulders.

Scout on river left.

Access

Type Name Elevation Camping Water Boat ramp Vehicle access Description
Put-In Tadpole Creek Trailhead 5,444 Feet No No No All Vehicles

Trailhead is off of Forrest Hill Road.  Access this road from I-80 just outside of Auburn and head east.  The hike in is about 3 miles to the river.  You will have to decide if it is worth taking overnight gear or going light and pushing for a day trip.

Put-In Euchre Bar Trail 2,194 Feet No No No All Vehicles

This trail is about 1.5 miles long from the trailhead to the river and footbridge.  This makes a nice put in or take out spot depending on how much of the North Fork you plan on running.  To access the trailhead, take the Alta exit off of I-80 and follow the frontage road to the trailhead.  This trail accesses the river from the North.

Take-Out Iowa Hill Road Bridge 2,194 Feet Yes No Yes All Vehicles

Follow the Iowa Hill road down to the river from Colfax.  Cross the bridge and you'll see the takeout immediately on your left.  There is a campground here as well.

Camps

No river camps added yet.

Permit

No permit is required, or permit info hasn't been added yet.

Fishing

No fish species have been associated with this run yet.

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