US Bridges

75th Pl SE over Mill Creek

PoorPosted for load

Marion County, Oregon · 051M E Delaney RD I-5 JCT · Structure no. 47C70 858

Built
1968
57 years old
Condition
Poor
inspected August 2024
Type
Slab
Wood or Timber
Length
75 ft
4 main spans
Daily traffic
223
2020 count
Owner
County
County Highway Agency

About this bridge

75th Pl SE over Mill Creek is a wood or timber slab carrying 75th Pl SE over Mill Creek 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 223 vehicles a day, roughly 5% of them trucks, projected to reach 249 by 2025. The structure is 75 ft (22.9 m) long and 25 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

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Carries75th Pl SE
CrossesMill Creek
Location051M E Delaney RD I-5 JCT
RouteCounty Highway C0858
CountyMarion County
StateOregon
Coordinates44.84349, -122.90559
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating18.2 US tons
Inventory rating14.3 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans4
Design loadH 20
Structure length75 ft (22.9 m)
Longest span20 ft (6.1 m)
Deck width25 ft (7.7 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic223 (2020)
Projected traffic249 by 2025
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed2.5 mi (4 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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$499,000
NavigationNo navigation control on waterway

Frequently asked questions

When was 75th Pl SE over Mill Creek built?

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

What condition is 75th Pl SE over Mill Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2024.

How much traffic does 75th Pl SE over Mill Creek carry?

About 223 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is 75th Pl SE over Mill Creek?

The structure is 75 ft (22.9 m) long with a longest span of 20 ft (6.1 m) and a deck 25 ft wide.

Who owns 75th Pl SE over Mill Creek?

It is owned by the County Highway Agency.