US Bridges

Ashton-Flagg Ranch over Fall River

Fair

Fremont County, Idaho · 4.0 N. 0.6 W. Drummond · Structure no. 000000000021105

Built
1969
56 years old
Condition
Fair
inspected October 2024
Type
Frame
Steel Continuous
Length
349 ft
3 main spans
Daily traffic
480
2023 count
Owner
County
County Highway Agency

About this bridge

Ashton-Flagg Ranch over Fall River is a steel continuous frame carrying Ashton-Flagg Ranch over Fall River in Fremont County, Idaho. It was built in 1969, so it is 56 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 5 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 480 vehicles a day, roughly 4% of them trucks, projected to reach 720 by 2042. The structure is 349 ft (106.4 m) long and 31 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesAshton-Flagg Ranch
CrossesFall River
Location4.0 N. 0.6 W. Drummond
RouteCounty Highway 0
CountyFremont County
StateIdaho
Coordinates44.05672, -111.35889
Functional classRural Minor 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations on dry land well above flood water elevations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56 US tons
Inventory rating33 US tons

Structure

Structure typeFrame
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length349 ft (106.4 m)
Longest span146 ft (44.5 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic480 (2023)
Projected traffic720 by 2042
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 Ashton-Flagg Ranch over Fall River built?

It was built in 1969, making it 56 years old in 2025.

What condition is Ashton-Flagg Ranch over Fall River 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 October 2024.

How much traffic does Ashton-Flagg Ranch over Fall River carry?

About 480 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Ashton-Flagg Ranch over Fall River?

The structure is 349 ft (106.4 m) long with a longest span of 146 ft (44.5 m) and a deck 31 ft wide.

Who owns Ashton-Flagg Ranch over Fall River?

It is owned by the County Highway Agency.