US Bridges

Griffin Road over Roza Canal

Good

Benton County, Washington · 0.9 N Evans Road · Structure no. 080383000000000

Built
1981
44 years old
Condition
Good
inspected February 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
44 ft
1 main span
Daily traffic
896
2016 count
Owner
County
County Highway Agency

About this bridge

Griffin Road over Roza Canal is a prestressed concrete stringer/multi-beam or girder carrying Griffin Road over Roza Canal in Benton County, Washington. It was built in 1981, so it is 44 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 896 vehicles a day, roughly 40% of them trucks, projected to reach 1,000 by 2038. The structure is 44 ft (13.4 m) long and 30 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesGriffin Road
CrossesRoza Canal
Location0.9 N Evans Road
RouteCounty Highway 20250
Coordinates46.30053, -119.85221
Functional classRural Minor Collector

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 protection8 Very GoodNo problems noted.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50.4 US tons
Inventory rating30 US tons

Structure

MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length44 ft (13.4 m)
Longest span44 ft (13.4 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic896 (2016)
Projected traffic1,000 by 2038
Trucks40%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway 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 Griffin Road over Roza Canal built?

It was built in 1981, making it 44 years old in 2025.

What condition is Griffin Road over Roza Canal 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 February 2024.

How much traffic does Griffin Road over Roza Canal carry?

About 896 vehicles per day (2016 count), of which roughly 40% are trucks.

How long is Griffin Road over Roza Canal?

The structure is 44 ft (13.4 m) long with a longest span of 44 ft (13.4 m) and a deck 30 ft wide.

Who owns Griffin Road over Roza Canal?

It is owned by the County Highway Agency.