US Bridges

S-S Ramp over Bn RR

Good

Pierce County, Washington · 3.1 N Thurston CO · Structure no. 0014963B0000000

Built
1997
28 years old
Condition
Good
inspected March 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
594 ft
5 main spans
Daily traffic
4,585
2023 count
Owner
State
State Highway Agency

About this bridge

S-S Ramp over Bn RR is a prestressed concrete continuous stringer/multi-beam or girder carrying S-S Ramp over Bn RR in Pierce County, Washington. It was built in 1997, so it is 28 years old, younger than the Washington average of 49.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 4,585 vehicles a day, roughly 2% of them trucks, projected to reach 6,413 by 2039. The structure is 594 ft (181.1 m) long and 28 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesS-S Ramp
CrossesBn RR
Location3.1 N Thurston CO
RouteInterstate 5
Coordinates47.08758, -122.64799
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating25.7 US tons
Inventory rating19.6 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 25 or greater
Structure length594 ft (181.1 m)
Longest span123 ft (37.5 m)
Deck width28 ft (8.6 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,585 (2023)
Projected traffic6,413 by 2039
Trucks2%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$8.2 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was S-S Ramp over Bn RR built?

It was built in 1997, making it 28 years old in 2025.

What condition is S-S Ramp over Bn RR in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in March 2023.

How much traffic does S-S Ramp over Bn RR carry?

About 4,585 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is S-S Ramp over Bn RR?

The structure is 594 ft (181.1 m) long with a longest span of 123 ft (37.5 m) and a deck 28 ft wide.

Who owns S-S Ramp over Bn RR?

It is owned by the State Highway Agency.