US Bridges

Poirire Ranch RD over Blanchard Creek

FairPosted for load

Bonner County, Idaho · 0.8 S. 0.8 W. Blanchard · Structure no. 000000000030165

Built
1965
60 years old, rebuilt 2014
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
59 ft
1 main span
Daily traffic
80
2023 count
Owner
County
County Highway Agency

About this bridge

Poirire Ranch RD over Blanchard Creek is a steel stringer/multi-beam or girder carrying Poirire Ranch RD over Blanchard Creek in Bonner County, Idaho. It was built in 1965 and reconstructed in 2014, so it is 60 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. Its operating status is: posted for load restriction.

It carries about 80 vehicles a day, roughly 14% of them trucks, projected to reach 120 by 2042. The structure is 59 ft (18 m) long and 16 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesPoirire Ranch RD
CrossesBlanchard Creek
Location0.8 S. 0.8 W. Blanchard
RouteCounty Highway 0
CountyBonner County
StateIdaho
Coordinates48.00461, -117.00222
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating36 US tons
Inventory rating24 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1
Design loadHS 15
Structure length59 ft (18 m)
Longest span57 ft (17.4 m)
Deck width16 ft (5 m)
Roadway width14 ft (4.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic80 (2023)
Projected traffic120 by 2042
Trucks14%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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$570,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Poirire Ranch RD over Blanchard Creek built?

It was built in 1965, making it 60 years old in 2025. It was reconstructed in 2014.

What condition is Poirire Ranch RD over Blanchard 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 Poirire Ranch RD over Blanchard Creek carry?

About 80 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is Poirire Ranch RD over Blanchard Creek?

The structure is 59 ft (18 m) long with a longest span of 57 ft (17.4 m) and a deck 16 ft wide.

Who owns Poirire Ranch RD over Blanchard Creek?

It is owned by the County Highway Agency.