US Bridges

Moss Creek Road over Miami River

Fair

Tillamook County, Oregon · JCT Miami R RD &moss Crrd · Structure no. 57C12 564 00001

Built
1974
51 years old
Condition
Fair
inspected June 2024
Type
Slab
Prestressed Concrete
Length
98 ft
1 main span
Daily traffic
116
2020 count
Owner
County
County Highway Agency

About this bridge

Moss Creek Road over Miami River is a prestressed concrete slab carrying Moss Creek Road over Miami River in Tillamook County, Oregon. It was built in 1974, so it is 51 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 116 vehicles a day, roughly 15% of them trucks, projected to reach 136 by 2025. The structure is 98 ft (29.9 m) long and 24 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesMoss Creek Road
CrossesMiami River
LocationJCT Miami R RD &moss Crrd
RouteCounty Highway C0564
StateOregon
Coordinates45.57497, -123.87382
Functional classRural Local

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 inspectionJune 2024
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 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 rating52.1 US tons
Inventory rating40.3 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans1 (+2 approach)
Design loadHS 20
Structure length98 ft (29.9 m)
Longest span45 ft (13.7 m)
Deck width24 ft (7.4 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic116 (2020)
Projected traffic136 by 2025
Trucks15%
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 Moss Creek Road over Miami River built?

It was built in 1974, making it 51 years old in 2025.

What condition is Moss Creek Road over Miami River 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 June 2024.

How much traffic does Moss Creek Road over Miami River carry?

About 116 vehicles per day (2020 count), of which roughly 15% are trucks.

How long is Moss Creek Road over Miami River?

The structure is 98 ft (29.9 m) long with a longest span of 45 ft (13.7 m) and a deck 24 ft wide.

Who owns Moss Creek Road over Miami River?

It is owned by the County Highway Agency.