US Bridges

Dunsmuir Avenue over Sacramento UP RR AMTRAK

Fair

Siskiyou County, California · 02-SIS-005-2.65-DMR · Structure no. 02 0002Y

Built
1966
59 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
830 ft
6 main spans
Daily traffic
5,000
2024 count
Owner
State
State Highway Agency

About this bridge

Dunsmuir Avenue over Sacramento UP RR AMTRAK is a steel continuous stringer/multi-beam or girder carrying Dunsmuir Avenue over Sacramento UP RR AMTRAK in Siskiyou County, California. It was built in 1966, so it is 59 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 5,000 vehicles a day, roughly 31% of them trucks, projected to reach 6,141 by 2045. The structure is 830 ft (253.1 m) long and 38 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesDunsmuir Avenue
CrossesSacramento UP RR AMTRAK
Location02-SIS-005-2.65-DMR
RouteInterstate 5
CountySiskiyou County
StateCalifornia
Coordinates41.21953, -122.27563
Functional classRural Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating34.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length830 ft (253.1 m)
Longest span190 ft (57.9 m)
Deck width38 ft (11.5 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,000 (2024)
Projected traffic6,141 by 2045
Trucks31%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad and waterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Dunsmuir Avenue over Sacramento UP RR AMTRAK built?

It was built in 1966, making it 59 years old in 2025.

What condition is Dunsmuir Avenue over Sacramento UP RR AMTRAK in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in July 2024.

How much traffic does Dunsmuir Avenue over Sacramento UP RR AMTRAK carry?

About 5,000 vehicles per day (2024 count), of which roughly 31% are trucks.

How long is Dunsmuir Avenue over Sacramento UP RR AMTRAK?

The structure is 830 ft (253.1 m) long with a longest span of 190 ft (57.9 m) and a deck 38 ft wide.

Who owns Dunsmuir Avenue over Sacramento UP RR AMTRAK?

It is owned by the State Highway Agency.