US Bridges

SR 28 over Irrigation Canal

Fair

Grant County, Washington · 4.5 E Douglas CO · Structure no. 000000MD0000000

Built
1952
73 years old
Condition
Fair
inspected February 2024
Type
Tee Beam
Concrete
Length
57 ft
1 main span
Daily traffic
10,968
2023 count
Owner
State
State Highway Agency

About this bridge

SR 28 over Irrigation Canal is a concrete tee beam carrying SR 28 over Irrigation Canal in Grant County, Washington. It was built in 1952, so it is 73 years old, older than the Washington average of 49.8 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 10,968 vehicles a day, roughly 15% of them trucks, projected to reach 13,111 by 2039. The structure is 57 ft (17.4 m) long and 40 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesSR 28
CrossesIrrigation Canal
Location4.5 E Douglas CO
RouteState Highway 28
CountyGrant County
StateWashington
Coordinates47.23244, -119.92158
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating26.8 US tons
Inventory rating20.7 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length57 ft (17.4 m)
Longest span54 ft (16.5 m)
Deck width40 ft (12.2 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,968 (2023)
Projected traffic13,111 by 2039
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.1 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 28 over Irrigation Canal built?

It was built in 1952, making it 73 years old in 2025.

What condition is SR 28 over Irrigation Canal 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 February 2024.

How much traffic does SR 28 over Irrigation Canal carry?

About 10,968 vehicles per day (2023 count), of which roughly 15% are trucks.

How long is SR 28 over Irrigation Canal?

The structure is 57 ft (17.4 m) long with a longest span of 54 ft (16.5 m) and a deck 40 ft wide.

Who owns SR 28 over Irrigation Canal?

It is owned by the State Highway Agency.