US Bridges

STC6807;BIG Sprgs over Henrys Lake Outlet

Fair

Fremont County, Idaho · 0.9 W. 2.4 E. Macks Inn · Structure no. 000000000032181

Built
1992
33 years old
Condition
Fair
inspected October 2024
Type
Tee Beam
Prestressed Concrete
Length
71 ft
1 main span
Daily traffic
1,200
2023 count
Owner
County
County Highway Agency

About this bridge

STC6807;BIG Sprgs over Henrys Lake Outlet is a prestressed concrete tee beam carrying STC6807;BIG Sprgs over Henrys Lake Outlet in Fremont 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 1,200 vehicles a day, roughly 1% of them trucks, projected to reach 1,800 by 2042. The structure is 71 ft (21.6 m) long and 30 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesSTC6807;BIG Sprgs
CrossesHenrys Lake Outlet
Location0.9 W. 2.4 E. Macks Inn
RouteFederal Lands Road 6807
CountyFremont County
StateIdaho
Coordinates44.51203, -111.29086
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 inspectionOctober 2024
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior 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, precast panels
Main spans1
Design loadHS 20
Structure length71 ft (21.6 m)
Longest span70 ft (21.3 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,200 (2023)
Projected traffic1,800 by 2042
Trucks1%
Lanes on structure2
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$809,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was STC6807;BIG Sprgs over Henrys Lake Outlet built?

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

What condition is STC6807;BIG Sprgs over Henrys Lake Outlet 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 October 2024.

How much traffic does STC6807;BIG Sprgs over Henrys Lake Outlet carry?

About 1,200 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is STC6807;BIG Sprgs over Henrys Lake Outlet?

The structure is 71 ft (21.6 m) long with a longest span of 70 ft (21.3 m) and a deck 30 ft wide.

Who owns STC6807;BIG Sprgs over Henrys Lake Outlet?

It is owned by the County Highway Agency.