US Bridges

SH 11 over Quartz Creek;three Mile

Fair

Clearwater County, Idaho · 1.8 N. Pierce · Structure no. 000000000010335

Built
1972
53 years old
Condition
Fair
inspected May 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
40 ft
1 main span
Daily traffic
210
2023 count
Owner
State
State Highway Agency

About this bridge

SH 11 over Quartz Creek;three Mile is a prestressed concrete box beam or girders - multiple carrying SH 11 over Quartz Creek;three Mile in Clearwater County, Idaho. It was built in 1972, so it is 53 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.

It carries about 210 vehicles a day, roughly 62% of them trucks, projected to reach 315 by 2042. The structure is 40 ft (12.2 m) long and 32 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSH 11
CrossesQuartz Creek;three Mile
Location1.8 N. Pierce
RouteState Highway 11
CountyClearwater County
StateIdaho
Coordinates46.5128, -115.8158
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating78 US tons
Inventory rating44 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length40 ft (12.2 m)
Longest span38 ft (11.6 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic210 (2023)
Projected traffic315 by 2042
Trucks62%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 11 over Quartz Creek;three Mile built?

It was built in 1972, making it 53 years old in 2025.

What condition is SH 11 over Quartz Creek;three Mile 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 May 2024.

How much traffic does SH 11 over Quartz Creek;three Mile carry?

About 210 vehicles per day (2023 count), of which roughly 62% are trucks.

How long is SH 11 over Quartz Creek;three Mile?

The structure is 40 ft (12.2 m) long with a longest span of 38 ft (11.6 m) and a deck 32 ft wide.

Who owns SH 11 over Quartz Creek;three Mile?

It is owned by the State Highway Agency.