Colville National Forest
  
Contributions to 8-digit HUCs:
     Colville National Forest contributes
          85% of the water and occupies 79% of the land in the Pend Oreille hydrologic unit (HUC 17010216)
          4% of the water and occupies 3% of the land in the Little Spokane hydrologic unit (HUC 17010308)
          1% of the water and occupies 1% of the land in the Franklin D. Roosevelt Lake hydrologic unit (HUC 17020001)
          9% of the water and occupies 12% of the land in the Kettle hydrologic unit (HUC 17020002)
          27% of the water and occupies 22% of the land in the Colville hydrologic unit (HUC 17020003)
          20% of the water and occupies 17% of the land in the Sanpoil hydrologic unit (HUC 17020004)
 
Contributions to 4-digit HUCs:
     Colville National Forest contributes
          2% of the water and occupies 2% of the land in the Kootenai-Pend Oreille-Spokane hydrologic unit (HUC 1701)
          1% of the water and occupies 2% of the land in the Upper Columbia hydrologic unit (HUC 1702)
 
Contributions to Streamflow:
     Colville National Forest contributes
          4% of the flow at the Pend Oreille River at the Canadian Border
          1% of the flow at the Columbia River at the confluence with Eagle Creek
          2% of the flow at the Columbia River at Lake Wallula
          4% of the flow at the Little Spokane River at the confluence with the Spokane River
          2% of the flow at the Columbia River at the HUC 17020001 boundary
          27% of the flow at the Colville River at the confluence with the Columbia River
          20% of the flow at the Sanpoil River at the confluence with the Columbia River
          2% of the flow at the Columbia River at the confluence with Lower Crab Creek
          2% of the flow at the Columbia River at the confluence with the Chelan River
          1% of the flow at the Columbia River at the confluence with the Washougal River
          1% of the flow at the Columbia River at Lake Umatilla