US Bridges

Richardson Road over Siuslaw River

Good

Lane County, Oregon · 0003 MI N JCT HWY126/5018 · Structure no. 14360B501800003

Built
1986
39 years old
Condition
Good
inspected August 2023
Type
Tee Beam
Prestressed Concrete
Length
247 ft
3 main spans
Daily traffic
218
2020 count
Owner
County
County Highway Agency

About this bridge

Richardson Road over Siuslaw River is a prestressed concrete tee beam carrying Richardson Road over Siuslaw River in Lane County, Oregon. It was built in 1986, so it is 39 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 218 vehicles a day, roughly 3% of them trucks, projected to reach 243 by 2025. The structure is 247 ft (75.3 m) long and 31 ft wide. If it were closed, the detour would be 5.6 mi (9 km).

CarriesRichardson Road
CrossesSiuslaw River
Location0003 MI N JCT HWY126/5018
RouteCounty Highway C5018
StateOregon
Coordinates44.00579, -123.70156
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 inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating22.2 US tons
Inventory rating17.2 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans3
Design loadHS 25 or greater
Structure length247 ft (75.3 m)
Longest span105 ft (32 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic218 (2020)
Projected traffic243 by 2025
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5.6 mi (9 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Richardson Road over Siuslaw River built?

It was built in 1986, making it 39 years old in 2025.

What condition is Richardson Road over Siuslaw River 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 August 2023.

How much traffic does Richardson Road over Siuslaw River carry?

About 218 vehicles per day (2020 count), of which roughly 3% are trucks.

How long is Richardson Road over Siuslaw River?

The structure is 247 ft (75.3 m) long with a longest span of 105 ft (32 m) and a deck 31 ft wide.

Who owns Richardson Road over Siuslaw River?

It is owned by the County Highway Agency.