US Bridges

Miller RD over Overflow Channel

FairPosted for load

Marion County, Oregon · 011MI W I-5 Santiam R Xng · Structure no. 47C78 914

Built
1963
62 years old
Condition
Fair
inspected August 2024
Type
Slab
Wood or Timber
Length
62 ft
3 main spans
Daily traffic
71
2020 count
Owner
County
County Highway Agency

About this bridge

Miller RD over Overflow Channel is a wood or timber slab carrying Miller RD over Overflow Channel in Marion County, Oregon. It was built in 1963, so it is 62 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 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 71 vehicles a day, roughly 8% of them trucks, projected to reach 79 by 2025. The structure is 62 ft (18.9 m) long and 22 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesMiller RD
CrossesOverflow Channel
Location011MI W I-5 Santiam R Xng
RouteCounty Highway C0914
StateOregon
Coordinates44.74144, -123.03186
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusPosted for load 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 rating27.4 US tons
Inventory rating21.1 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadH 20
Structure length62 ft (18.9 m)
Longest span21 ft (6.4 m)
Deck width22 ft (6.7 m)
Roadway width20 ft (6.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic71 (2020)
Projected traffic79 by 2025
Trucks8%
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 Miller RD over Overflow Channel built?

It was built in 1963, making it 62 years old in 2025.

What condition is Miller RD over Overflow Channel 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 Miller RD over Overflow Channel carry?

About 71 vehicles per day (2020 count), of which roughly 8% are trucks.

How long is Miller RD over Overflow Channel?

The structure is 62 ft (18.9 m) long with a longest span of 21 ft (6.4 m) and a deck 22 ft wide.

Who owns Miller RD over Overflow Channel?

It is owned by the County Highway Agency.