Eureka, California

Eureka Slough Bridge (Humboldt County, California)
Built 1920
Through truss bridge over Eureka Sough on California Route 101
No longer exists

Marina Road Underpass (Humboldt County, California)
Built 1979
Corrugated multi-plate arch bridge over Marina Road on State Route 255
Open to traffic

NWP - Eureka Slough Bridge (Humboldt County, California)
Deck plate girder bridge over Eureka Slough on Northwestern Pacific Railroad (NWP)
Open to authorized vehicles only

NWP - Eureka Slough Bridge (1916) (Humboldt County, California)
Built 1916
Lost Through truss bridge over Eureka Slough on Northwestern Pacific RR
Replaced by a new bridge

Samoa Bridge (Humboldt County, California)
Built 1971
Steel stringer bridge over Humboldt Bay on CA255
Open to traffic