US Bridges

Paddy Flat Road over Boulder Creek

Poor

Valley County, Idaho · 3.0 N. 1.6 E. Donnelly · Structure no. 000000000028629

Built
1978
47 years old
Condition
Poor
inspected August 2024
Type
Culvert
Steel
Length
30 ft
3 main spans
Daily traffic
230
2023 count
Owner
County
County Highway Agency

About this bridge

Paddy Flat Road over Boulder Creek is a steel culvert carrying Paddy Flat Road over Boulder Creek in Valley County, Idaho. It was built in 1978, so it is 47 years old, older than the Idaho average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 230 vehicles a day, roughly 35% of them trucks, projected to reach 345 by 2039. The structure is 30 ft (9.1 m) long and 35 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesPaddy Flat Road
CrossesBoulder Creek
Location3.0 N. 1.6 E. Donnelly
RouteCounty Highway 0
CountyValley County
StateIdaho
Coordinates44.7745, -116.04539
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Last inspectionAugust 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating89.9 US tons
Inventory rating89 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans3
Design loadHS 20
Structure length30 ft (9.1 m)
Longest span9 ft (2.6 m)
Deck width35 ft (10.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic230 (2023)
Projected traffic345 by 2039
Trucks35%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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$303,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Paddy Flat Road over Boulder Creek built?

It was built in 1978, making it 47 years old in 2025.

What condition is Paddy Flat Road over Boulder Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2024.

How much traffic does Paddy Flat Road over Boulder Creek carry?

About 230 vehicles per day (2023 count), of which roughly 35% are trucks.

How long is Paddy Flat Road over Boulder Creek?

The structure is 30 ft (9.1 m) long with a longest span of 9 ft (2.6 m) and a deck 35 ft wide.

Who owns Paddy Flat Road over Boulder Creek?

It is owned by the County Highway Agency.