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Ahtanum Creek Bridge


Old US 97 bridge

Photo taken by Dave Cox in March 2017


BH Photo #387115


Ownership appears to be BNSF as the locked gate sign implies. The road south of the bridge appears to be used both by BNSF and irrigation control. There is a diversion dam where the road ends. This leads me to believe that the new US97 was constructed at the same time to allow for the dam to be built, causing the abandonment.

NBI has this bridge in the wrong location as I82 does not cross Ahtanum Creek. NBI suggests the bridge was built in 1900; historical photos (date stamped 1910) say otherwise.


Concrete stringer bridge over Ahtanum Creek on Original US 97
South of Union Gap, Yakima County, Washington
Intact and used by BNSF and Irrigation Control
Built after 1920s and bypassed in 1942 with the new US97 bridge now in use.
Concrete stringer
Length of largest span: 12.1 ft.
Total length: 26.9 ft.
Approximate latitude, longitude
+46.53479, -120.47237   (decimal degrees)
46°32'05" N, 120°28'21" W   (degrees°minutes'seconds")
Approximate UTM coordinates
10/693822/5156572 (zone/easting/northing)
Quadrangle map:
Yakima East
Average daily traffic (as of 2014)
Inventory number
BH 76571 (Bridgehunter.com ID)
Inspection report (as of February 2018)
Overall condition: Good
Sufficiency rating: 49.8 (out of 100)
View more at BridgeReports.com

Update Log 

  • May 11, 2017: Updated by Dave Cox: Changed date on when the bridge was built.
  • April 15, 2017: Added by Dave Cox


  • Dave Cox


Ahtanun Creek Bridge or old US 97
Posted June 5, 2019, by Steve Gillett (gillett [at] alumni [dot] caltech [dot] edu)

It's "Ahtanum" Creek (note the final "m", not "n." Back in the 80s we lived in the area briefly. It's locally pronounced "uh-TAN-um", btw.