US Bridges

Grandad Road over N.Fk.Clearwater;grandad

Good

Clearwater County, Idaho · 2.4 N. 12.3 E. Elk River · Structure no. 000000000029030

Built
1971
54 years old
Condition
Good
inspected May 2024
Type
Truss - Deck
Steel Continuous
Length
1,208 ft
3 main spans
Daily traffic
100
2023 count
Owner
State
Other State Agency

About this bridge

Grandad Road over N.Fk.Clearwater;grandad is a steel continuous truss - deck carrying Grandad Road over N.Fk.Clearwater;grandad in Clearwater County, Idaho. It was built in 1971, so it is 54 years old, older than the Idaho average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 100 vehicles a day, roughly 25% of them trucks, projected to reach 150 by 2039. The structure is 1,208 ft (368.2 m) long and 30 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesGrandad Road
CrossesN.Fk.Clearwater;grandad
Location2.4 N. 12.3 E. Elk River
RouteCounty Highway 0
CountyClearwater County
StateIdaho
Coordinates46.81456, -115.91875
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.1 US tons
Inventory rating46 US tons

Structure

Structure typeTruss - Deck
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+2 approach)
Design loadHS 20
Structure length1,208 ft (368.2 m)
Longest span504 ft (153.6 m)
Deck width30 ft (9.2 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2023)
Projected traffic150 by 2039
Trucks25%
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

OwnerOther State Agency
Maintained byOther State Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was Grandad Road over N.Fk.Clearwater;grandad built?

It was built in 1971, making it 54 years old in 2025.

What condition is Grandad Road over N.Fk.Clearwater;grandad in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2024.

How much traffic does Grandad Road over N.Fk.Clearwater;grandad carry?

About 100 vehicles per day (2023 count), of which roughly 25% are trucks.

How long is Grandad Road over N.Fk.Clearwater;grandad?

The structure is 1,208 ft (368.2 m) long with a longest span of 504 ft (153.6 m) and a deck 30 ft wide.

Who owns Grandad Road over N.Fk.Clearwater;grandad?

It is owned by the Other State Agency.