US Bridges

Hawthorne Ave over Mill Creek

Fair

Marion County, Oregon · .25MI N. Mission St. · Structure no. 470252

Built
1985
40 years old
Condition
Fair
inspected August 2023
Type
Slab
Prestressed Concrete
Length
181 ft
3 main spans
Daily traffic
14,607
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Hawthorne Ave over Mill Creek is a prestressed concrete slab carrying Hawthorne Ave over Mill Creek in Marion 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 14,607 vehicles a day, roughly 5% of them trucks, projected to reach 16,286 by 2025. The structure is 181 ft (55.2 m) long and 72 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesHawthorne Ave
CrossesMill Creek
Location.25MI N. Mission St.
RouteCity Street C0000
CountyMarion County
StateOregon
Coordinates44.92137, -122.99569
Functional classUrban Minor 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98 US tons
Inventory rating61.9 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHS 25 or greater
Structure length181 ft (55.2 m)
Longest span60 ft (18.3 m)
Deck width72 ft (21.9 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,607 (2020)
Projected traffic16,286 by 2025
Trucks5%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Hawthorne Ave over Mill Creek built?

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

What condition is Hawthorne Ave over Mill Creek 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 August 2023.

How much traffic does Hawthorne Ave over Mill Creek carry?

About 14,607 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is Hawthorne Ave over Mill Creek?

The structure is 181 ft (55.2 m) long with a longest span of 60 ft (18.3 m) and a deck 72 ft wide.

Who owns Hawthorne Ave over Mill Creek?

It is owned by the City or Municipal Highway Agency.