US Bridges

Old Pacific HWY N over I-5

Good

Cowlitz County, Washington · 2.8 N JCT SR 504 · Structure no. 0008335C0000000

Built
1968
57 years old
Condition
Good
inspected March 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
290 ft
3 main spans
Daily traffic
721
2016 count
Owner
State
State Highway Agency

About this bridge

Old Pacific HWY N over I-5 is a concrete continuous box beam or girders - multiple carrying Old Pacific HWY N over I-5 in Cowlitz County, Washington. It was built in 1968, so it is 57 years old, older 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 721 vehicles a day, roughly 1% of them trucks, projected to reach 1,040 by 2038. The structure is 290 ft (88.4 m) long and 33 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesOld Pacific HWY N
CrossesI-5
Location2.8 N JCT SR 504
RouteCounty Highway 0
Coordinates46.32412, -122.91316
Functional classRural Minor Collector

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.
Substructure8 Very GoodNo problems noted.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55 US tons
Inventory rating42.5 US tons

Structure

MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length290 ft (88.4 m)
Longest span129 ft (39.3 m)
Deck width33 ft (10.1 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic721 (2016)
Projected traffic1,040 by 2038
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed5 mi (8 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$4.7 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Old Pacific HWY N over I-5 built?

It was built in 1968, making it 57 years old in 2025.

What condition is Old Pacific HWY N 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 March 2024.

How much traffic does Old Pacific HWY N over I-5 carry?

About 721 vehicles per day (2016 count), of which roughly 1% are trucks.

How long is Old Pacific HWY N over I-5?

The structure is 290 ft (88.4 m) long with a longest span of 129 ft (39.3 m) and a deck 33 ft wide.

Who owns Old Pacific HWY N over I-5?

It is owned by the State Highway Agency.