US Bridges

Peterson Ranch RD over Hayden Creek

FairPosted for load

Lemhi County, Idaho · 1.2 N. 0.5 W. Lemhi · Structure no. 000000000032675

Built
1955
70 years old, rebuilt 2009
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
30 ft
1 main span
Daily traffic
70
2023 count
Owner
County
County Highway Agency

About this bridge

Peterson Ranch RD over Hayden Creek is a wood or timber stringer/multi-beam or girder carrying Peterson Ranch RD over Hayden Creek in Lemhi County, Idaho. It was built in 1955 and reconstructed in 2009, so it is 70 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 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 70 vehicles a day, roughly 10% of them trucks, projected to reach 105 by 2039. The structure is 30 ft (9.1 m) long and 22 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesPeterson Ranch RD
CrossesHayden Creek
Location1.2 N. 0.5 W. Lemhi
RouteCounty Highway 0
CountyLemhi County
StateIdaho
Coordinates44.8675, -113.62814
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating14 US tons
Inventory rating8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 20
Structure length30 ft (9.1 m)
Longest span27 ft (8.2 m)
Deck width22 ft (6.8 m)
Roadway width21 ft (6.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic70 (2023)
Projected traffic105 by 2039
Trucks10%
Lanes on structure2
Traffic directionTwo-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$347,000 (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Peterson Ranch RD over Hayden Creek built?

It was built in 1955, making it 70 years old in 2025. It was reconstructed in 2009.

What condition is Peterson Ranch RD over Hayden 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 April 2023.

How much traffic does Peterson Ranch RD over Hayden Creek carry?

About 70 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Peterson Ranch RD over Hayden Creek?

The structure is 30 ft (9.1 m) long with a longest span of 27 ft (8.2 m) and a deck 22 ft wide.

Who owns Peterson Ranch RD over Hayden Creek?

It is owned by the County Highway Agency.