Water Type Definitions Table

During surveys of Redmond’s streams, Washington Trout documented fish presence and recorded physical attributes of stream habitat. Water type designations (per WDNR) were made according to these data, with each type category defined by biological and physical criteria. In the absence of fish observations, physical criteria, when satisfied, can define a water body as fish habitat.

Type*	Biological Criteria (Fish Presence)	Physical Criteria (Fish Habitat)	Ponds	Human Use
1		Shorelines of the State, rivers with defined channel greater than 20 ft.
2	Used by substantial numbers of fish for spawning, rearing, or migration.	Defined channel at least 20 ft. wide, with a gradient less than 4%. Or, is used by salmonids for off-channel habitat.	Ponds with surface area greater than 1 acre.	Diverted for use to serve more than 100 residential or camping units, or diverted for a fish hatchery.
3	Used by significant numbers of fish for spawning, rearing, or migration.	Defined channel at least 2 ft. wide, with a gradient less than 16%. If the contributing basin size is greater than 50 acres, gradient may be up to 20%.	Ponds having surface area less than 1 acre at seasonal low water and having an outlet to a fish stream. Or, ponds with a surface area greater than 0.5 acres at seasonal low water.	Diverted for use to serve more than 10 residential or camping units.
4	Waters not used by fish.	Perennial flow, defined channel less than 2 ft. wide.
5	Waters not used by fish.	Seasonal flow.
9	Unknown/Unclassified.

*WDNR water type categories per Washington Administrative Code 222-16-031.