Longer than the Snake? Rivers flowing from the NR carry runoff from rain and snow. The Salmon River, flowing 420 miles, is the longest river in Idaho.
The Salmon runs from Stanley Basin at the foot of Galena Pass, through the Northern Rockies and joining the Snake River 40 miles south of Lewiston
The River of No Return Named for the deeply eroded valleys and the boiling rapids experienced by rafters
Feferal recognition of the magnificence of this region in isolation, beauty, and uniqueness
1 2 3 4 5 6 78 9 10 11 12 13 1.Kootenai River 2.Pend Oreille River 3.Priest River 4.Coeur d’Alene River 5.St. Joe River 6.St. Maries River 7.Clearwater River 8.Lochsa River 9.Selway River 10. Salmon River 11. Payette River 12. Boise River 13. Lost Rivers Rivers of the Northern Rockies
Glaciation in Idaho 15,000 years ago ice covered all of NR that was below 8000 feet in elevation 1000’s of feet thick carving/scouring the landscape of NR in many places Great weight caused glacial ice to move As they moved down V river valleys they remodeled them into U glacier valleys Left piles of debris called moraines Left moraine dams and flat valley floors Left many alpine features in the NR
Pend Oreille - Carved by ice Coeur d’Alene – River valley blocked by terminal moraine Ross Point Hill (terminal moraine) overlooking Rathdrum Prairie (glacial flood deposits)
Water erosion figures into the geologic landforms of the N. Rockies leaving many V- shaped valleys
Alluvial fans often formed at the openings of the v- shaped valleys
ClimateClimate - precipitation Wetter than the rest of the state Moisture forced out as air force to rise over the Rockies –20 inches in Post Falls –40 inches in Wallace/Mullan area Precipitation in Panhandle = 30” Southcentral = 7-26 Snowfall heavy because of elevation
This is caused by moist air which flows through the Columbia Gorge in the Cascades from the Pacific and to the Northern Rockies. It then is wrung dry as it climbs the face of the Rockies. return
It is approximately 60-75” annually in most places; McCall = 151”;Stanley, Challis = 94” return
Climate - temperature Low winter average = 20 degrees Southcentral average = 10 degrees Summer average = 84 degrees in the panhandle, 88 in southcentral back
Northern Rockies are the most heavily forested part of Idaho.