US Bridges

Otto Miller Road over So Fork Scappoose Creek

Good

Columbia County, Oregon · 040 MI W of HWY 30 · Structure no. 18246 112100005

Built
1999
26 years old
Condition
Good
inspected May 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
87 ft
1 main span
Daily traffic
299
2020 count
Owner
County
County Highway Agency

About this bridge

Otto Miller Road over So Fork Scappoose Creek is a prestressed concrete box beam or girders - multiple carrying Otto Miller Road over So Fork Scappoose Creek in Columbia County, Oregon. It was built in 1999, so it is 26 years old, younger than the Oregon average of 49.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 299 vehicles a day, roughly 10% of them trucks, projected to reach 339 by 2025. The structure is 87 ft (26.6 m) long and 28 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesOtto Miller Road
CrossesSo Fork Scappoose Creek
Location040 MI W of HWY 30
RouteCounty Highway C1121
StateOregon
Coordinates45.74458, -122.95998
Functional classRural Minor Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating53.2 US tons
Inventory rating41.1 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 25 or greater
Structure length87 ft (26.6 m)
Longest span87 ft (26.6 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic299 (2020)
Projected traffic339 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 Otto Miller Road over So Fork Scappoose Creek built?

It was built in 1999, making it 26 years old in 2025.

What condition is Otto Miller Road over So Fork Scappoose Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2023.

How much traffic does Otto Miller Road over So Fork Scappoose Creek carry?

About 299 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Otto Miller Road over So Fork Scappoose Creek?

The structure is 87 ft (26.6 m) long with a longest span of 87 ft (26.6 m) and a deck 28 ft wide.

Who owns Otto Miller Road over So Fork Scappoose Creek?

It is owned by the County Highway Agency.