US Bridges

Stc 9693;SEAMANS G over Farmers Union Canal

Fair

Ada County, Idaho · Seamans Gulch;hill RD · Structure no. 000000000026156

Built
1992
33 years old
Condition
Fair
inspected March 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
24 ft
1 main span
Daily traffic
4,700
2023 count
Owner
County
County Highway Agency

About this bridge

Stc 9693;SEAMANS G over Farmers Union Canal is a prestressed concrete box beam or girders - multiple carrying Stc 9693;SEAMANS G over Farmers Union Canal in Ada County, Idaho. It was built in 1992, so it is 33 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 4,700 vehicles a day, roughly 12% of them trucks, projected to reach 7,050 by 2042. The structure is 24 ft (7.3 m) long and 56 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesStc 9693;SEAMANS G
CrossesFarmers Union Canal
LocationSeamans Gulch;hill RD
RouteCounty Highway 9693
StateIdaho
Coordinates43.68711, -116.28797
Functional classUrban Minor Arterial

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum 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

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 25 or greater
Structure length24 ft (7.3 m)
Longest span22 ft (6.6 m)
Deck width56 ft (17.1 m)
Roadway width53 ft (16.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,700 (2023)
Projected traffic7,050 by 2042
Trucks12%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway 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 9693;SEAMANS G over Farmers Union Canal built?

It was built in 1992, making it 33 years old in 2025.

What condition is Stc 9693;SEAMANS G over Farmers Union 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 March 2024.

How much traffic does Stc 9693;SEAMANS G over Farmers Union Canal carry?

About 4,700 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is Stc 9693;SEAMANS G over Farmers Union Canal?

The structure is 24 ft (7.3 m) long with a longest span of 22 ft (6.6 m) and a deck 56 ft wide.

Who owns Stc 9693;SEAMANS G over Farmers Union Canal?

It is owned by the County Highway Agency.