US Bridges

Pioneer Road over Shafer Creek

Good

Boise County, Idaho · 1.0S 0.1W Horseshoe Bend · Structure no. 000000000026675

Built
1988
37 years old
Condition
Good
inspected May 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
55 ft
1 main span
Daily traffic
290
2023 count
Owner
County
County Highway Agency

About this bridge

Pioneer Road over Shafer Creek is a prestressed concrete box beam or girders - multiple carrying Pioneer Road over Shafer Creek in Boise County, Idaho. It was built in 1988, so it is 37 years old, younger than the Idaho average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 290 vehicles a day, roughly 4% of them trucks, projected to reach 435 by 2042. The structure is 55 ft (16.8 m) long and 28 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

CarriesPioneer Road
CrossesShafer Creek
Location1.0S 0.1W Horseshoe Bend
RouteCounty Highway 0
StateIdaho
Coordinates43.90123, -116.20191
Functional classRural Minor Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating78 US tons
Inventory rating40 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 25 or greater
Structure length55 ft (16.8 m)
Longest span52 ft (15.8 m)
Deck width28 ft (8.5 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic290 (2023)
Projected traffic435 by 2042
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 Pioneer Road over Shafer Creek built?

It was built in 1988, making it 37 years old in 2025.

What condition is Pioneer Road over Shafer Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2024.

How much traffic does Pioneer Road over Shafer Creek carry?

About 290 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Pioneer Road over Shafer Creek?

The structure is 55 ft (16.8 m) long with a longest span of 52 ft (15.8 m) and a deck 28 ft wide.

Who owns Pioneer Road over Shafer Creek?

It is owned by the County Highway Agency.