US Bridges

SH 27 over B-4 Canal

Fair

Minidoka County, Idaho · 1.0 S. Paul · Structure no. 000000000013345

Built
1963
62 years old
Condition
Fair
inspected March 2023
Type
Tee Beam
Concrete
Length
36 ft
1 main span
Daily traffic
8,700
2023 count
Owner
State
State Highway Agency

About this bridge

SH 27 over B-4 Canal is a concrete tee beam carrying SH 27 over B-4 Canal in Minidoka County, Idaho. It was built in 1963, so it is 62 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 8,700 vehicles a day, roughly 8% of them trucks, projected to reach 13,050 by 2042. The structure is 36 ft (11 m) long and 42 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesSH 27
CrossesB-4 Canal
Location1.0 S. Paul
RouteState Highway 27
CountyMinidoka County
StateIdaho
Coordinates42.59, -113.78361
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 protection8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44 US tons
Inventory rating26 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length36 ft (11 m)
Longest span34 ft (10.4 m)
Deck width42 ft (12.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,700 (2023)
Projected traffic13,050 by 2042
Trucks8%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$664,000 (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 27 over B-4 Canal built?

It was built in 1963, making it 62 years old in 2025.

What condition is SH 27 over B-4 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 2023.

How much traffic does SH 27 over B-4 Canal carry?

About 8,700 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is SH 27 over B-4 Canal?

The structure is 36 ft (11 m) long with a longest span of 34 ft (10.4 m) and a deck 42 ft wide.

Who owns SH 27 over B-4 Canal?

It is owned by the State Highway Agency.