US Bridges

Kilpatrick Br. Rd. over Silver Creek

PoorPosted for load

Blaine County, Idaho · 0.5 N. 3.5 W. Picabo · Structure no. 000000000023780

Built
1978
47 years old
Condition
Poor
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
65 ft
2 main spans
Daily traffic
60
2023 count
Owner
County
County Highway Agency

About this bridge

Kilpatrick Br. Rd. over Silver Creek is a steel stringer/multi-beam or girder carrying Kilpatrick Br. Rd. over Silver Creek in Blaine 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 2 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. Its operating status is: posted for load restriction.

It carries about 60 vehicles a day, roughly 20% of them trucks, projected to reach 90 by 2042. The structure is 65 ft (19.8 m) long and 21 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesKilpatrick Br. Rd.
CrossesSilver Creek
Location0.5 N. 3.5 W. Picabo
RouteCounty Highway 0
CountyBlaine County
StateIdaho
Coordinates43.31472, -114.13561
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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure2 CriticalAdvanced deterioration of primary structural elements. Bridge may be closed until corrective action is taken.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourScour critical; extensive scour has occurred
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating28.8 US tons
Inventory rating17.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckClosed grating
Main spans2
Design loadH 15
Structure length65 ft (19.8 m)
Longest span32 ft (9.8 m)
Deck width21 ft (6.5 m)
Roadway width19 ft (5.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic60 (2023)
Projected traffic90 by 2042
Trucks20%
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$624,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Kilpatrick Br. Rd. over Silver Creek built?

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

What condition is Kilpatrick Br. Rd. over Silver 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 September 2024.

How much traffic does Kilpatrick Br. Rd. over Silver Creek carry?

About 60 vehicles per day (2023 count), of which roughly 20% are trucks.

How long is Kilpatrick Br. Rd. over Silver Creek?

The structure is 65 ft (19.8 m) long with a longest span of 32 ft (9.8 m) and a deck 21 ft wide.

Who owns Kilpatrick Br. Rd. over Silver Creek?

It is owned by the County Highway Agency.