US Bridges

Dowton Lane over Pahsimeroi River

Good

Custer County, Idaho · 5.0 S 3.4 E Ellis · Structure no. 000000000031811

Built
2016
9 years old
Condition
Good
inspected April 2022
Type
Stringer/Multi-beam or Girder
Steel
Length
81 ft
1 main span
Daily traffic
100
2023 count
Owner
County
County Highway Agency

About this bridge

Dowton Lane over Pahsimeroi River is a steel stringer/multi-beam or girder carrying Dowton Lane over Pahsimeroi River in Custer County, Idaho. It was built in 2016, so it is 9 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 100 vehicles a day, roughly 11% of them trucks, projected to reach 150 by 2042. The structure is 81 ft (24.7 m) long and 28 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

CarriesDowton Lane
CrossesPahsimeroi River
Location5.0 S 3.4 E Ellis
RouteCounty Highway 0
StateIdaho
Coordinates44.6185, -113.98108
Functional classRural Local

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 protection7 GoodSome minor problems.
Last inspectionApril 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating50.4 US tons
Inventory rating38.9 US tons

Structure

MaterialSteel
DeckCorrugated steel
Main spans1
Design loadHL 93
Structure length81 ft (24.7 m)
Longest span80 ft (24.4 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2023)
Projected traffic150 by 2042
Trucks11%
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 Dowton Lane over Pahsimeroi River built?

It was built in 2016, making it 9 years old in 2025.

What condition is Dowton Lane over Pahsimeroi River 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 2022.

How much traffic does Dowton Lane over Pahsimeroi River carry?

About 100 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is Dowton Lane over Pahsimeroi River?

The structure is 81 ft (24.7 m) long with a longest span of 80 ft (24.4 m) and a deck 28 ft wide.

Who owns Dowton Lane over Pahsimeroi River?

It is owned by the County Highway Agency.