US Bridges

SH 45 over Mora Canal

Fair

Canyon County, Idaho · 7.5 S. Nampa · Structure no. 000000000014305

Built
1956
69 years old
Condition
Fair
inspected February 2024
Type
Tee Beam
Concrete
Length
50 ft
1 main span
Daily traffic
4,000
2023 count
Owner
State
State Highway Agency

About this bridge

SH 45 over Mora Canal is a concrete tee beam carrying SH 45 over Mora Canal in Canyon County, Idaho. It was built in 1956, so it is 69 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 4,000 vehicles a day, roughly 8% of them trucks, projected to reach 6,000 by 2042. The structure is 50 ft (15.2 m) long and 31 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesSH 45
CrossesMora Canal
Location7.5 S. Nampa
RouteState Highway 45
CountyCanyon County
StateIdaho
Coordinates43.44212, -116.57326
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
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 rating49.1 US tons
Inventory rating29 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length50 ft (15.2 m)
Longest span48 ft (14.6 m)
Deck width31 ft (9.3 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,000 (2023)
Projected traffic6,000 by 2042
Trucks8%
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 statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$762,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 45 over Mora Canal built?

It was built in 1956, making it 69 years old in 2025.

What condition is SH 45 over Mora 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 SH 45 over Mora Canal carry?

About 4,000 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is SH 45 over Mora Canal?

The structure is 50 ft (15.2 m) long with a longest span of 48 ft (14.6 m) and a deck 31 ft wide.

Who owns SH 45 over Mora Canal?

It is owned by the State Highway Agency.