4

The principal stream valleys, as already stated, are steep-sided and

U-shaped. All except the main north-south valley are narrow.
main valley has a flat floor half a mile wide over

their way with frequent changes of course.

are rapid, glacially fed, and unnavigable.

is 85 feet a mile up to the mouth of Am

steeper above that point. The grade of

mile, that of Bitter creek is about 125 fee

cier creek and Marmot river are 400 feet

main north-south valley is straight, where