US Bridges

S4808;ROBINSON Pk over S.Fk.Palouse River

Good

Latah County, Idaho · 0.5 N. 2.8 E. Moscow · Structure no. 000000000020321

Built
2018
7 years old
Condition
Good
inspected July 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
49 ft
1 main span
Daily traffic
690
2023 count
Owner
Local
Other Local Agency

About this bridge

S4808;ROBINSON Pk over S.Fk.Palouse River is a prestressed concrete box beam or girders - multiple carrying S4808;ROBINSON Pk over S.Fk.Palouse River in Latah County, Idaho. It was built in 2018, so it is 7 years old, younger than the Idaho average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 690 vehicles a day, roughly 5% of them trucks, projected to reach 1,035 by 2042. The structure is 49 ft (14.9 m) long and 38 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesS4808;ROBINSON Pk
CrossesS.Fk.Palouse River
Location0.5 N. 2.8 E. Moscow
RouteCounty Highway 4808
StateIdaho
Coordinates46.74086, -116.94167
Functional classRural Major Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating76.1 US tons
Inventory rating56.1 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length49 ft (14.9 m)
Longest span46 ft (14 m)
Deck width38 ft (11.7 m)
Roadway width37 ft (11.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic690 (2023)
Projected traffic1,035 by 2042
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerOther Local Agency
Maintained byOther Local Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was S4808;ROBINSON Pk over S.Fk.Palouse River built?

It was built in 2018, making it 7 years old in 2025.

What condition is S4808;ROBINSON Pk over S.Fk.Palouse 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 July 2024.

How much traffic does S4808;ROBINSON Pk over S.Fk.Palouse River carry?

About 690 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is S4808;ROBINSON Pk over S.Fk.Palouse River?

The structure is 49 ft (14.9 m) long with a longest span of 46 ft (14 m) and a deck 38 ft wide.

Who owns S4808;ROBINSON Pk over S.Fk.Palouse River?

It is owned by the Other Local Agency.