Boise

1

Boise > South Fork > North Fork.

Bruneau

2

Bruneau > Jarbidge > West Fork

Clearwater

3

Clearwater > Lochsa > Selway > SF CW

Owyhee

4

South Fork, Three Forks

Salmon

6

Salmon River > MF > SF

Snake

1

Snake River, Hells Canyon, Murtaugh, Milner, more.