US Bridges

STC3895;JOHNSON CR over Riordan Creek

Good

Valley County, Idaho · 3.5 S. 0.3 E. Yellow Pine · Structure no. 000000000028646

Built
1997
28 years old
Condition
Good
inspected August 2021
Type
Stringer/Multi-beam or Girder
Steel
Length
40 ft
1 main span
Daily traffic
70
2023 count
Owner
County
County Highway Agency

About this bridge

STC3895;JOHNSON CR over Riordan Creek is a steel stringer/multi-beam or girder carrying STC3895;JOHNSON CR over Riordan Creek in Valley County, Idaho. It was built in 1997, so it is 28 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 70 vehicles a day, roughly 75% of them trucks, projected to reach 105 by 2042. The structure is 40 ft (12.2 m) long and 18 ft wide. If it were closed, the detour would be 26.1 mi (42 km).

Location

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CarriesSTC3895;JOHNSON CR
CrossesRiordan Creek
Location3.5 S. 0.3 E. Yellow Pine
RouteCounty Highway 3895
CountyValley County
StateIdaho
Coordinates44.90678, -115.48542
Functional classRural Major Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating87 US tons
Inventory rating52 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHS 20
Structure length40 ft (12.2 m)
Longest span38 ft (11.6 m)
Deck width18 ft (5.5 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic70 (2023)
Projected traffic105 by 2042
Trucks75%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed26.1 mi (42 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 STC3895;JOHNSON CR over Riordan Creek built?

It was built in 1997, making it 28 years old in 2025.

What condition is STC3895;JOHNSON CR over Riordan 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 August 2021.

How much traffic does STC3895;JOHNSON CR over Riordan Creek carry?

About 70 vehicles per day (2023 count), of which roughly 75% are trucks.

How long is STC3895;JOHNSON CR over Riordan Creek?

The structure is 40 ft (12.2 m) long with a longest span of 38 ft (11.6 m) and a deck 18 ft wide.

Who owns STC3895;JOHNSON CR over Riordan Creek?

It is owned by the County Highway Agency.