US Bridges

East Mapleton Road over Plowman Creek

Fair

Lane County, Oregon · 008MI NE JCT 126 & HWY36 · Structure no. 39C517503000037

Built
1977
48 years old
Condition
Fair
inspected September 2023
Type
Slab
Prestressed Concrete
Length
42 ft
1 main span
Daily traffic
732
2020 count
Owner
County
County Highway Agency

About this bridge

East Mapleton Road over Plowman Creek is a prestressed concrete slab carrying East Mapleton Road over Plowman Creek in Lane County, Oregon. It was built in 1977, so it is 48 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 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 732 vehicles a day, roughly 10% of them trucks, projected to reach 842 by 2025. The structure is 42 ft (12.8 m) long and 28 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesEast Mapleton Road
CrossesPlowman Creek
Location008MI NE JCT 126 & HWY36
RouteCounty Highway C5030
StateOregon
Coordinates44.03658, -123.85904
Functional classRural Minor Collector

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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.5 US tons
Inventory rating32.8 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length42 ft (12.8 m)
Longest span41 ft (12.5 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic732 (2020)
Projected traffic842 by 2025
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was East Mapleton Road over Plowman Creek built?

It was built in 1977, making it 48 years old in 2025.

What condition is East Mapleton Road over Plowman 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 September 2023.

How much traffic does East Mapleton Road over Plowman Creek carry?

About 732 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is East Mapleton Road over Plowman Creek?

The structure is 42 ft (12.8 m) long with a longest span of 41 ft (12.5 m) and a deck 28 ft wide.

Who owns East Mapleton Road over Plowman Creek?

It is owned by the County Highway Agency.