US Bridges

STC3747;W Locust L over Deer Flat High Line Cnl

Fair

Canyon County, Idaho · 3.2 S. 4.9 W. Nampa · Structure no. 000000000027148

Built
1997
28 years old
Condition
Fair
inspected March 2023
Type
Frame
Concrete
Length
24 ft
1 main span
Daily traffic
1,400
2023 count
Owner
Local
Other Local Agency

About this bridge

STC3747;W Locust L over Deer Flat High Line Cnl is a concrete frame carrying STC3747;W Locust L over Deer Flat High Line Cnl in Canyon County, Idaho. It was built in 1997, so it is 28 years old, younger 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 4% of them trucks, projected to reach 2,100 by 2042. The structure is 24 ft (7.3 m) long and 50 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSTC3747;W Locust L
CrossesDeer Flat High Line Cnl
Location3.2 S. 4.9 W. Nampa
RouteCounty Highway 3747
CountyCanyon County
StateIdaho
Coordinates43.53183, -116.65958
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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52 US tons
Inventory rating31 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length24 ft (7.3 m)
Longest span23 ft (6.9 m)
Deck width50 ft (15.2 m)
Roadway width49 ft (14.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,400 (2023)
Projected traffic2,100 by 2042
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was STC3747;W Locust L over Deer Flat High Line Cnl built?

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

What condition is STC3747;W Locust L over Deer Flat High Line Cnl 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 March 2023.

How much traffic does STC3747;W Locust L over Deer Flat High Line Cnl carry?

About 1,400 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is STC3747;W Locust L over Deer Flat High Line Cnl?

The structure is 24 ft (7.3 m) long with a longest span of 23 ft (6.9 m) and a deck 50 ft wide.

Who owns STC3747;W Locust L over Deer Flat High Line Cnl?

It is owned by the Other Local Agency.