US Bridges

Or 99W (hwy 91) over HWY 1W NB to HWY 1 NB

Fair

Multnomah County, Oregon · 1.2 MI N of HWY 144 · Structure no. 07758C01W 00740

Built
1985
40 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
521 ft
4 main spans
Daily traffic
38,397
2022 count
Owner
State
State Highway Agency

About this bridge

Or 99W (hwy 91) over HWY 1W NB to HWY 1 NB is a prestressed concrete stringer/multi-beam or girder carrying Or 99W (hwy 91) over HWY 1W NB to HWY 1 NB in Multnomah County, Oregon. It was built in 1985, so it is 40 years old, younger than the Oregon average of 49.9 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 38,397 vehicles a day, roughly 2% of them trucks, projected to reach 41,300 by 2042. The structure is 521 ft (158.7 m) long and 72 ft wide.

Location

Open in Google Maps
CarriesOr 99W (hwy 91)
CrossesHWY 1W NB to HWY 1 NB
Location1.2 MI N of HWY 144
RouteState Highway 99
CountyMultnomah County
StateOregon
Coordinates45.44353, -122.73975
Functional classUrban Other Principal Arterial

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating15.8 US tons
Inventory rating12.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4 (+1 approach)
Design loadHS 25 or greater
Structure length521 ft (158.7 m)
Longest span136 ft (41.6 m)
Deck width72 ft (21.9 m)
Roadway width63 ft (19.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic38,397 (2022)
Projected traffic41,300 by 2042
Trucks2%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$6.2 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was Or 99W (hwy 91) over HWY 1W NB to HWY 1 NB built?

It was built in 1985, making it 40 years old in 2025.

What condition is Or 99W (hwy 91) over HWY 1W NB to HWY 1 NB 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 February 2024.

How much traffic does Or 99W (hwy 91) over HWY 1W NB to HWY 1 NB carry?

About 38,397 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is Or 99W (hwy 91) over HWY 1W NB to HWY 1 NB?

The structure is 521 ft (158.7 m) long with a longest span of 136 ft (41.6 m) and a deck 72 ft wide.

Who owns Or 99W (hwy 91) over HWY 1W NB to HWY 1 NB?

It is owned by the State Highway Agency.