US Bridges

Plum St-N Ramp over I-5

Good

Thurston County, Washington · 1.2 N JCT US 101 · Structure no. 0012835E0000000

Built
1986
39 years old
Condition
Good
inspected November 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
270 ft
2 main spans
Daily traffic
6,876
2023 count
Owner
State
State Highway Agency

About this bridge

Plum St-N Ramp over I-5 is a prestressed concrete continuous box beam or girders - multiple carrying Plum St-N Ramp over I-5 in Thurston County, Washington. It was built in 1986, so it is 39 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 6,876 vehicles a day, roughly 5% of them trucks, projected to reach 10,480 by 2039. The structure is 270 ft (82.3 m) long and 31 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesPlum St-N Ramp
CrossesI-5
Location1.2 N JCT US 101
RouteInterstate 5
CountyThurston County
StateWashington
Coordinates47.03581, -122.88586
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 inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating99 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length270 ft (82.3 m)
Longest span134 ft (40.8 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,876 (2023)
Projected traffic10,480 by 2039
Trucks5%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$3.8 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Plum St-N Ramp over I-5 built?

It was built in 1986, making it 39 years old in 2025.

What condition is Plum St-N Ramp over I-5 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 November 2023.

How much traffic does Plum St-N Ramp over I-5 carry?

About 6,876 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Plum St-N Ramp over I-5?

The structure is 270 ft (82.3 m) long with a longest span of 134 ft (40.8 m) and a deck 31 ft wide.

Who owns Plum St-N Ramp over I-5?

It is owned by the State Highway Agency.