US Bridges

N. First Ave over Salem Ditch

Fair

Marion County, Oregon · 13 S of HWY 22 · Structure no. 47B003006600000

Built
1968
57 years old
Condition
Fair
inspected August 2024
Type
Slab
Prestressed Concrete
Length
40 ft
1 main span
Daily traffic
11,432
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

N. First Ave over Salem Ditch is a prestressed concrete slab carrying N. First Ave over Salem Ditch in Marion County, Oregon. It was built in 1968, so it is 57 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 11,432 vehicles a day, roughly 10% of them trucks, projected to reach 14,833 by 2025. The structure is 40 ft (12.2 m) long and 51 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

Open in Google Maps
CarriesN. First Ave
CrossesSalem Ditch
Location13 S of HWY 22
RouteCity Street C0000
CountyMarion County
StateOregon
Coordinates44.79832, -122.79435
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74 US tons
Inventory rating45 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length40 ft (12.2 m)
Longest span33 ft (10.1 m)
Deck width51 ft (15.4 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,432 (2020)
Projected traffic14,833 by 2025
Trucks10%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed19.9 mi (32 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$174,000
NavigationNo navigation control on waterway

Frequently asked questions

When was N. First Ave over Salem Ditch built?

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

What condition is N. First Ave over Salem Ditch 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 2024.

How much traffic does N. First Ave over Salem Ditch carry?

About 11,432 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is N. First Ave over Salem Ditch?

The structure is 40 ft (12.2 m) long with a longest span of 33 ft (10.1 m) and a deck 51 ft wide.

Who owns N. First Ave over Salem Ditch?

It is owned by the City or Municipal Highway Agency.