US Bridges

STC7684;SAND Road over S.Fk.Palouse River

FairPosted for load

Latah County, Idaho · In Moscow · Structure no. 000000000029520

Built
1971
54 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
51 ft
1 main span
Daily traffic
950
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

STC7684;SAND Road over S.Fk.Palouse River is a steel stringer/multi-beam or girder carrying STC7684;SAND Road over S.Fk.Palouse River in Latah County, Idaho. It was built in 1971, so it is 54 years old, older than the Idaho average of 45.3 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 950 vehicles a day, roughly 4% of them trucks, projected to reach 1,425 by 2042. The structure is 51 ft (15.5 m) long and 24 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesSTC7684;SAND Road
CrossesS.Fk.Palouse River
LocationIn Moscow
RouteCounty Highway 7684
CountyLatah County
StateIdaho
Coordinates46.71383, -117.02267
Functional classRural Major Collector

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 inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating29 US tons
Inventory rating17 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHS 15
Structure length51 ft (15.5 m)
Longest span50 ft (15.2 m)
Deck width24 ft (7.4 m)
Roadway width23 ft (7.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic950 (2023)
Projected traffic1,425 by 2042
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$648,000 (2017 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was STC7684;SAND Road over S.Fk.Palouse River built?

It was built in 1971, making it 54 years old in 2025.

What condition is STC7684;SAND Road over S.Fk.Palouse River 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 September 2023.

How much traffic does STC7684;SAND Road over S.Fk.Palouse River carry?

About 950 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is STC7684;SAND Road over S.Fk.Palouse River?

The structure is 51 ft (15.5 m) long with a longest span of 50 ft (15.2 m) and a deck 24 ft wide.

Who owns STC7684;SAND Road over S.Fk.Palouse River?

It is owned by the City or Municipal Highway Agency.