US Bridges

Harvard Road over South Fork Rock Creek

Good

Spokane County, Washington · 3.5 Mi. E Fairfield · Structure no. 086049000000000

Built
1993
32 years old
Condition
Good
inspected July 2023
Type
Tee Beam
Prestressed Concrete
Length
72 ft
1 main span
Daily traffic
45
2019 count
Owner
County
County Highway Agency

About this bridge

Harvard Road over South Fork Rock Creek is a prestressed concrete tee beam carrying Harvard Road over South Fork Rock Creek in Spokane County, Washington. It was built in 1993, so it is 32 years old, younger than the Washington average of 49.8 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 45 vehicles a day, roughly 47% of them trucks, projected to reach 64 by 2040. The structure is 72 ft (21.9 m) long and 31 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesHarvard Road
CrossesSouth Fork Rock Creek
Location3.5 Mi. E Fairfield
RouteCounty Highway 1737
Coordinates47.36375, -117.0996
Functional classRural Local

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 inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating26.5 US tons
Inventory rating20.4 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length72 ft (21.9 m)
Longest span71 ft (21.6 m)
Deck width31 ft (9.4 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic45 (2019)
Projected traffic64 by 2040
Trucks47%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedDeck rehabilitation with only incidental widening
Estimated improvement cost$821,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Harvard Road over South Fork Rock Creek built?

It was built in 1993, making it 32 years old in 2025.

What condition is Harvard Road over South Fork Rock Creek 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 2023.

How much traffic does Harvard Road over South Fork Rock Creek carry?

About 45 vehicles per day (2019 count), of which roughly 47% are trucks.

How long is Harvard Road over South Fork Rock Creek?

The structure is 72 ft (21.9 m) long with a longest span of 71 ft (21.6 m) and a deck 31 ft wide.

Who owns Harvard Road over South Fork Rock Creek?

It is owned by the County Highway Agency.