US Bridges

Rivergate/Lombard over B-105 X Columbia Slough

Fair

Multnomah County, Oregon · Terminal 6 - Rivergate · Structure no. 25B105000 00000

Built
1985
40 years old, rebuilt 2010
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
254 ft
3 main spans
Daily traffic
6,965
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Rivergate/Lombard over B-105 X Columbia Slough is a prestressed concrete stringer/multi-beam or girder carrying Rivergate/Lombard over B-105 X Columbia Slough in Multnomah County, Oregon. It was built in 1985 and reconstructed in 2010, so it is 40 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 6 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 6,965 vehicles a day, roughly 20% of them trucks, projected to reach 7,715 by 2025. The structure is 254 ft (77.4 m) long and 35 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesRivergate/Lombard
CrossesB-105 X Columbia Slough
LocationTerminal 6 - Rivergate
RouteCity Street 9958
CountyMultnomah County
StateOregon
Coordinates45.6391, -122.7631
Functional classUrban Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
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 rating99 US tons
Inventory rating64 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length254 ft (77.4 m)
Longest span83 ft (25.3 m)
Deck width35 ft (10.8 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,965 (2020)
Projected traffic7,715 by 2025
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was Rivergate/Lombard over B-105 X Columbia Slough built?

It was built in 1985, making it 40 years old in 2025. It was reconstructed in 2010.

What condition is Rivergate/Lombard over B-105 X Columbia Slough 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 July 2024.

How much traffic does Rivergate/Lombard over B-105 X Columbia Slough carry?

About 6,965 vehicles per day (2020 count), of which roughly 20% are trucks.

How long is Rivergate/Lombard over B-105 X Columbia Slough?

The structure is 254 ft (77.4 m) long with a longest span of 83 ft (25.3 m) and a deck 35 ft wide.

Who owns Rivergate/Lombard over B-105 X Columbia Slough?

It is owned by the City or Municipal Highway Agency.