US Bridges

STC6870;PAHSIMEROI over Big Creek Fish Passage

Good

Custer County, Idaho · 9.0 S. 10.4 E. May · Structure no. 000000000034633

Built
2014
11 years old
Condition
Good
inspected April 2021
Type
Stringer/Multi-beam or Girder
Steel
Length
50 ft
1 main span
Daily traffic
30
2023 count
Owner
County
County Highway Agency

About this bridge

STC6870;PAHSIMEROI over Big Creek Fish Passage is a steel stringer/multi-beam or girder carrying STC6870;PAHSIMEROI over Big Creek Fish Passage in Custer County, Idaho. It was built in 2014, so it is 11 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 30 vehicles a day, roughly 50% of them trucks, projected to reach 45 by 2042. The structure is 50 ft (15.2 m) long and 24 ft wide. If it were closed, the detour would be 42.3 mi (68 km).

CarriesSTC6870;PAHSIMEROI
CrossesBig Creek Fish Passage
Location9.0 S. 10.4 E. May
RouteCounty Highway 6870
StateIdaho
Coordinates44.47103, -113.70075
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.8 US tons
Inventory rating36.8 US tons

Structure

MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHL 93
Structure length50 ft (15.2 m)
Longest span48 ft (14.6 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (2023)
Projected traffic45 by 2042
Trucks50%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed42.3 mi (68 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 STC6870;PAHSIMEROI over Big Creek Fish Passage built?

It was built in 2014, making it 11 years old in 2025.

What condition is STC6870;PAHSIMEROI over Big Creek Fish Passage 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 April 2021.

How much traffic does STC6870;PAHSIMEROI over Big Creek Fish Passage carry?

About 30 vehicles per day (2023 count), of which roughly 50% are trucks.

How long is STC6870;PAHSIMEROI over Big Creek Fish Passage?

The structure is 50 ft (15.2 m) long with a longest span of 48 ft (14.6 m) and a deck 24 ft wide.

Who owns STC6870;PAHSIMEROI over Big Creek Fish Passage?

It is owned by the County Highway Agency.