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South Thorp Hwy over Light Ditch

Kittitas County, Washington · rated Fair in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

South Thorp Hwy over Light Ditch in Kittitas County, Washington, is rated in fair condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 6 (satisfactory condition) on the 0-9 scale.
It was built in 1936 and reconstructed in 1978, making it 89 years old at the 2025 inventory.
It carries about 1,972 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 145 of the 313 inventoried bridges in Kittitas County rated fair (46.3%); 35 (11.2%) are rated poor.
A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.

Component ratings


Structure	Continuous concrete stringer or multi-beam girder
Length	about 29 ft
Location	00.14 NW Robinson C
NBI structure number	083945000000000
Condition class	Fair

Source: FHWA National Bridge Inventory, 2025 data as reported by the Washington department of transportation.

Bridge	Built	Vehicles/day	Condition
I-90 over Coal Creek	1928	18,069	Fair
I-90 over Coal Creek	1956	18,069	Poor
I-90 over Animal Crossing	2010	18,069	Good
I-90 over Animal Crossing	2012	18,069	Good
I-90 over Gold Creek	2011	18,069	Fair
I-90 over Gold Creek	2012	18,069	Good