US Bridges

White Mtn Road over Dodge Creek

Fair

Boundary County, Idaho · 3.3 S. 2.8 W. Naples · Structure no. 000000000030320

Built
1983
42 years old
Condition
Fair
inspected August 2024
Type
Girder and Floorbeam System
Steel
Length
31 ft
1 main span
Daily traffic
30
2023 count
Owner
County
County Highway Agency

About this bridge

White Mtn Road over Dodge Creek is a steel girder and floorbeam system carrying White Mtn Road over Dodge Creek in Boundary County, Idaho. It was built in 1983, so it is 42 years old, younger 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 6 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 30 vehicles a day, roughly 50% of them trucks, projected to reach 45 by 2042. The structure is 31 ft (9.4 m) long and 20 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesWhite Mtn Road
CrossesDodge Creek
Location3.3 S. 2.8 W. Naples
RouteCounty Highway 0
CountyBoundary County
StateIdaho
Coordinates48.523, -116.45969
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating69 US tons
Inventory rating47.6 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckSteel plate
Main spans1
Design loadHS 20
Structure length31 ft (9.4 m)
Longest span28 ft (8.5 m)
Deck width20 ft (6 m)
Roadway width20 ft (6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (2023)
Projected traffic45 by 2042
Trucks50%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$360,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was White Mtn Road over Dodge Creek built?

It was built in 1983, making it 42 years old in 2025.

What condition is White Mtn Road over Dodge Creek 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 August 2024.

How much traffic does White Mtn Road over Dodge Creek carry?

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

How long is White Mtn Road over Dodge Creek?

The structure is 31 ft (9.4 m) long with a longest span of 28 ft (8.5 m) and a deck 20 ft wide.

Who owns White Mtn Road over Dodge Creek?

It is owned by the County Highway Agency.