US Bridges

STC3842;OLD Frzout over Black Canyon Canal

Fair

Gem County, Idaho · 2.7 S. 0.8 E. Emmett · Structure no. 000000000028085

Built
1950
75 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
99 ft
2 main spans
Daily traffic
360
2023 count
Owner
County
County Highway Agency

About this bridge

STC3842;OLD Frzout over Black Canyon Canal is a steel stringer/multi-beam or girder carrying STC3842;OLD Frzout over Black Canyon Canal in Gem County, Idaho. It was built in 1950, so it is 75 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 5 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 360 vehicles a day, roughly 20% of them trucks, projected to reach 540 by 2042. The structure is 99 ft (30.2 m) long and 31 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSTC3842;OLD Frzout
CrossesBlack Canyon Canal
Location2.7 S. 0.8 E. Emmett
RouteCounty Highway 3842
CountyGem County
StateIdaho
Coordinates43.83794, -116.48461
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
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 alignment6: Equal to present minimum criteria
Operating rating51 US tons
Inventory rating30 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length99 ft (30.2 m)
Longest span46 ft (14 m)
Deck width31 ft (9.3 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic360 (2023)
Projected traffic540 by 2042
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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$944,000 (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was STC3842;OLD Frzout over Black Canyon Canal built?

It was built in 1950, making it 75 years old in 2025.

What condition is STC3842;OLD Frzout over Black Canyon 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 October 2023.

How much traffic does STC3842;OLD Frzout over Black Canyon Canal carry?

About 360 vehicles per day (2023 count), of which roughly 20% are trucks.

How long is STC3842;OLD Frzout over Black Canyon Canal?

The structure is 99 ft (30.2 m) long with a longest span of 46 ft (14 m) and a deck 31 ft wide.

Who owns STC3842;OLD Frzout over Black Canyon Canal?

It is owned by the County Highway Agency.