US Bridges

STC3755;SOUTHSIDE over Mora Canal

Fair

Canyon County, Idaho · 8.9 S. 1.4 E. Nampa · Structure no. 000000000026900

Built
1975
50 years old
Condition
Fair
inspected February 2023
Type
Tee Beam
Prestressed Concrete
Length
51 ft
1 main span
Daily traffic
1,400
2023 count
Owner
Local
Other Local Agency

About this bridge

STC3755;SOUTHSIDE over Mora Canal is a prestressed concrete tee beam carrying STC3755;SOUTHSIDE over Mora Canal in Canyon County, Idaho. It was built in 1975, so it is 50 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 1,400 vehicles a day, roughly 7% of them trucks, projected to reach 2,100 by 2042. The structure is 51 ft (15.5 m) long and 48 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSTC3755;SOUTHSIDE
CrossesMora Canal
Location8.9 S. 1.4 E. Nampa
RouteCounty Highway 3755
CountyCanyon County
StateIdaho
Coordinates43.44958, -116.53342
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38 US tons
Inventory rating23 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length51 ft (15.5 m)
Longest span49 ft (14.9 m)
Deck width48 ft (14.7 m)
Roadway width47 ft (14.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,400 (2023)
Projected traffic2,100 by 2042
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerOther Local Agency
Maintained byOther Local Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$770,000 (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was STC3755;SOUTHSIDE over Mora Canal built?

It was built in 1975, making it 50 years old in 2025.

What condition is STC3755;SOUTHSIDE 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 2023.

How much traffic does STC3755;SOUTHSIDE over Mora Canal carry?

About 1,400 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is STC3755;SOUTHSIDE over Mora Canal?

The structure is 51 ft (15.5 m) long with a longest span of 49 ft (14.9 m) and a deck 48 ft wide.

Who owns STC3755;SOUTHSIDE over Mora Canal?

It is owned by the Other Local Agency.