US Bridges

Eastside HWY over Irrigation Canal

Good

Ravalli County, Montana · Corvallis-Eastside HWY · Structure no. S00269005+03001

Built
1997
28 years old
Condition
Good
inspected November 2024
Type
Tee Beam
Prestressed Concrete
Length
39 ft
1 main span
Daily traffic
4,348
2023 count
Owner
State
State Highway Agency

About this bridge

Eastside HWY over Irrigation Canal is a prestressed concrete tee beam carrying Eastside HWY over Irrigation Canal in Ravalli County, Montana. It was built in 1997, so it is 28 years old, younger than the Montana average of 47 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 4,348 vehicles a day, projected to reach 4,565 by 2043. The structure is 39 ft (11.9 m) long and 33 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesEastside HWY
CrossesIrrigation Canal
LocationCorvallis-Eastside HWY
RouteState Highway 269
CountyRavalli County
StateMontana
Coordinates46.30631, -114.11395
Functional classRural Major 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 inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74 US tons
Inventory rating48 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length39 ft (11.9 m)
Longest span36 ft (11.1 m)
Deck width33 ft (10.2 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,348 (2023)
Projected traffic4,565 by 2043
Trucks0%
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

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$116,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Eastside HWY over Irrigation Canal built?

It was built in 1997, making it 28 years old in 2025.

What condition is Eastside HWY over Irrigation 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 November 2024.

How much traffic does Eastside HWY over Irrigation Canal carry?

About 4,348 vehicles per day (2023 count).

How long is Eastside HWY over Irrigation Canal?

The structure is 39 ft (11.9 m) long with a longest span of 36 ft (11.1 m) and a deck 33 ft wide.

Who owns Eastside HWY over Irrigation Canal?

It is owned by the State Highway Agency.