Limiting Factors



Columbia Gorge Province

Little White Salmon Subbasin 383

Chum
Key Limiting Factor Impairment Habitat Affected Threat Type Threat Name Life Stage (s) Description
Habitat Quantity and Quality Access and Availability; Morphological Changes Estuary Agricultural Practices; Urbanization Diking; Filling; Riparian Degradation; Wetland Loss Smolts Historical complex habitats have been modified through channelization, diking, development and other practices.
Habitat Quantity and Quality Small-Scale Structural Complexity; Morphological Changes Freshwater-Instream Agricultural Practices; Forest Management Diking; Filling; Wood/Structure Removal Fry Current large woody debris levels are low throughout the basin.
Instantaneous Mortality Anthropogenic Mortality -- Dam or Hydropower Facility Management Migration Impediments Juveniles Juveniles and adults must pass Bonneville Dam during migration.
Sediment Conditions Increased Sediment Quantity Freshwater-Instream Agricultural Practices; Forest Management; Urbanization Sediment: Bank Destabilization; Impervious Surfaces (Road Density); Riparian Degradation Fry The greatest impairments relative to sediment are located in the lower two watersheds and in the Lava Creek drainage.
FALL CHINOOK
Key Limiting Factor Impairment Habitat Affected Threat Type Threat Name Life Stage (s) Description
Habitat Quantity and Quality Access and Availability Freshwater-Instream Dam or Hydropower Facility Management; Urbanization; Forest Management Migration Impediments Adults Two dams (one at the Little White Salmon Hatchery and the other on Lost Creek (north) adjacent to a diversion intake) restrict passage. Fifteen culverts present barriers to fish passage.
Habitat Quantity and Quality Access and Availability; Morphological Changes Estuary Agricultural Practices; Forest Management; Urbanization Diking; Filling; Riparian Degradation; Wetland Loss Smolts Historical complex habitats have been modified through channelization, diking, development and other practices.
Habitat Quantity and Quality Small-Scale Structural Complexity; Morphological Changes Freshwater-Instream Agricultural Practices; Forest Management Wood/Structure Removal Fry Current large woody debris levels are low throughout the basin especially in Lost Creek (north) and Goose Lake Creek.
Instantaneous Mortality Anthropogenic Mortality -- Fishery Management Harvest Adults Fall Chinook are subject to both ocean and freshwater harvest.
Instantaneous Mortality Anthropogenic Mortality -- Dam or Hydropower Facility Management Migration Impediments Juveniles Juveniles and adults must pass Bonneville Dam during migration.
Sediment Conditions Increased Sediment Quantity Freshwater-Instream Agricultural Practices; Forest Management Sediment: Bank Destabilization; Sediment: Upland Disturbance Juveniles Little White Salmon headwaters, mid-Little White Salmon/Cabbage Creek, mid-Little White Salmon/Berry Creek and the two lowermost mainstem watersheds are considered moderately impaired relative to conditions that influence sediment supply. The greatest impairments relative to sediment are located in the lower two watersheds and in the Lava Creek drainage.
Water Quality Temperature; Turbidity -- Water Management Water: Temperature and Gas Alteration Adults High temperatures in Drano Lake may affect passage. Exceedance of the temperature standard has occurred in Dry Creek, the mainstem above 201 Road, the mainstem above Lusk Creek, the mainstem at Berry Creek, and the mainstem above Moss Creek. Turbidity levels are high throughout the mainstem and Lusk Creek and are attributed to bank cutting on the mainstem and timber harvest in the upper basin.
Water Quantity Decreased Water Quantity -- Agricultural Practices Water: Storage or Withdrawal, Channelization, Management Juveniles Flow diversion on Lost Creek directs flow into the Coyote Ditch reducing flow in Lower Lost Creek by one-third during low flow periods.