US Bridges

Stc 6699;W 17th N over Great Western Canal

Fair

Bonneville County, Idaho · 1.4 N. 2.9 W. Idaho Falls · Structure no. 000000000031115

Built
1940
85 years old, rebuilt 1959
Condition
Fair
inspected November 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
32 ft
1 main span
Daily traffic
680
2023 count
Owner
County
County Highway Agency

About this bridge

Stc 6699;W 17th N over Great Western Canal is a prestressed concrete box beam or girders - multiple carrying Stc 6699;W 17th N over Great Western Canal in Bonneville County, Idaho. It was built in 1940 and reconstructed in 1959, so it is 85 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 680 vehicles a day, roughly 1% of them trucks, projected to reach 1,020 by 2042. The structure is 32 ft (9.8 m) long and 32 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesStc 6699;W 17th N
CrossesGreat Western Canal
Location1.4 N. 2.9 W. Idaho Falls
RouteCounty Highway 6699
CountyBonneville County
StateIdaho
Coordinates43.51133, -112.09814
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 inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating30 US tons
Inventory rating18 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 15
Structure length32 ft (9.8 m)
Longest span31 ft (9.4 m)
Deck width32 ft (9.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic680 (2023)
Projected traffic1,020 by 2042
Trucks1%
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

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$367,000 (2017 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Stc 6699;W 17th N over Great Western Canal built?

It was built in 1940, making it 85 years old in 2025. It was reconstructed in 1959.

What condition is Stc 6699;W 17th N over Great Western 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 November 2023.

How much traffic does Stc 6699;W 17th N over Great Western Canal carry?

About 680 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is Stc 6699;W 17th N over Great Western Canal?

The structure is 32 ft (9.8 m) long with a longest span of 31 ft (9.4 m) and a deck 32 ft wide.

Who owns Stc 6699;W 17th N over Great Western Canal?

It is owned by the County Highway Agency.