US Bridges

Morrison to HWY 1 over Conn 4 to HWY 1 NB

Fair

Multnomah County, Oregon · 0.3 MI S of Burnside Br · Structure no. 08589D001 30150

Built
1963
62 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
942 ft
9 main spans
Daily traffic
44,376
2022 count
Owner
State
State Highway Agency

About this bridge

Morrison to HWY 1 over Conn 4 to HWY 1 NB is a steel stringer/multi-beam or girder carrying Morrison to HWY 1 over Conn 4 to HWY 1 NB in Multnomah County, Oregon. It was built in 1963, so it is 62 years old, older 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 5 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 44,376 vehicles a day, roughly 7% of them trucks, projected to reach 35,600 by 2040. The structure is 942 ft (287.1 m) long and 27 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesMorrison to HWY 1
CrossesConn 4 to HWY 1 NB
Location0.3 MI S of Burnside Br
RouteInterstate 5
CountyMultnomah County
StateOregon
Coordinates45.5193, -122.6661
Functional classUrban 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 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 geometry6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating26.8 US tons
Inventory rating20.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans9 (+2 approach)
Design loadHS 20
Structure length942 ft (287.1 m)
Longest span150 ft (45.7 m)
Deck width27 ft (8.2 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deck19 ft (5.9 m)

Traffic and service

Average daily traffic44,376 (2022)
Projected traffic35,600 by 2040
Trucks7%
Lanes on structure1
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Morrison to HWY 1 over Conn 4 to HWY 1 NB built?

It was built in 1963, making it 62 years old in 2025.

What condition is Morrison to HWY 1 over Conn 4 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 May 2023.

How much traffic does Morrison to HWY 1 over Conn 4 to HWY 1 NB carry?

About 44,376 vehicles per day (2022 count), of which roughly 7% are trucks.

How long is Morrison to HWY 1 over Conn 4 to HWY 1 NB?

The structure is 942 ft (287.1 m) long with a longest span of 150 ft (45.7 m) and a deck 27 ft wide.

Who owns Morrison to HWY 1 over Conn 4 to HWY 1 NB?

It is owned by the State Highway Agency.