US Bridges

SH 6 over Palouse River;harvard Br

Fair

Latah County, Idaho · 1.5 N. Harvard · Structure no. 000000000018825

Built
1974
51 years old
Condition
Fair
inspected July 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
81 ft
1 main span
Daily traffic
910
2023 count
Owner
State
State Highway Agency

About this bridge

SH 6 over Palouse River;harvard Br is a prestressed concrete box beam or girders - multiple carrying SH 6 over Palouse River;harvard Br in Latah County, Idaho. It was built in 1974, so it is 51 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.

It carries about 910 vehicles a day, roughly 34% of them trucks, projected to reach 1,365 by 2042. The structure is 81 ft (24.8 m) long and 40 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesSH 6
CrossesPalouse River;harvard Br
Location1.5 N. Harvard
RouteState Highway 6
CountyLatah County
StateIdaho
Coordinates46.92697, -116.70744
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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56 US tons
Inventory rating12 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length81 ft (24.8 m)
Longest span80 ft (24.4 m)
Deck width40 ft (12.3 m)
Roadway width38 ft (11.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic910 (2023)
Projected traffic1,365 by 2042
Trucks34%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$795,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 6 over Palouse River;harvard Br built?

It was built in 1974, making it 51 years old in 2025.

What condition is SH 6 over Palouse River;harvard Br 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 2023.

How much traffic does SH 6 over Palouse River;harvard Br carry?

About 910 vehicles per day (2023 count), of which roughly 34% are trucks.

How long is SH 6 over Palouse River;harvard Br?

The structure is 81 ft (24.8 m) long with a longest span of 80 ft (24.4 m) and a deck 40 ft wide.

Who owns SH 6 over Palouse River;harvard Br?

It is owned by the State Highway Agency.