US Bridges

Stc 3750;MIDDLETON over Fifteen Mile Creek

Good

Canyon County, Idaho · 0.8 S. 0.3 E. Middleton · Structure no. 000000000019721

Built
2004
21 years old
Condition
Good
inspected November 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
92 ft
1 main span
Daily traffic
11,000
2023 count
Owner
Local
Other Local Agency

About this bridge

Stc 3750;MIDDLETON over Fifteen Mile Creek is a prestressed concrete stringer/multi-beam or girder carrying Stc 3750;MIDDLETON over Fifteen Mile Creek in Canyon County, Idaho. It was built in 2004, so it is 21 years old, younger than the Idaho average of 45.3 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 11,000 vehicles a day, roughly 9% of them trucks, projected to reach 16,500 by 2042. The structure is 92 ft (28 m) long and 53 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

CarriesStc 3750;MIDDLETON
CrossesFifteen Mile Creek
Location0.8 S. 0.3 E. Middleton
RouteCounty Highway 3750
StateIdaho
Coordinates43.69381, -116.61297
Functional classUrban Other Principal Arterial

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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating97 US tons
Inventory rating50 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length92 ft (28 m)
Longest span89 ft (27.2 m)
Deck width53 ft (16.2 m)
Roadway width39 ft (11.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,000 (2023)
Projected traffic16,500 by 2042
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed8.7 mi (14 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 Stc 3750;MIDDLETON over Fifteen Mile Creek built?

It was built in 2004, making it 21 years old in 2025.

What condition is Stc 3750;MIDDLETON over Fifteen Mile Creek 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 Stc 3750;MIDDLETON over Fifteen Mile Creek carry?

About 11,000 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is Stc 3750;MIDDLETON over Fifteen Mile Creek?

The structure is 92 ft (28 m) long with a longest span of 89 ft (27.2 m) and a deck 53 ft wide.

Who owns Stc 3750;MIDDLETON over Fifteen Mile Creek?

It is owned by the Other Local Agency.