US Bridges

SH 78 over Reynolds Creek

Fair

Owyhee County, Idaho · 16.4 E. Marsing · Structure no. 000000000015264

Built
1954
71 years old
Condition
Fair
inspected February 2023
Type
Culvert
Steel
Length
30 ft
3 main spans
Daily traffic
460
2023 count
Owner
State
State Highway Agency

About this bridge

SH 78 over Reynolds Creek is a steel culvert carrying SH 78 over Reynolds Creek in Owyhee County, Idaho. It was built in 1954, so it is 71 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 460 vehicles a day, roughly 31% of them trucks, projected to reach 690 by 2042. The structure is 30 ft (9.1 m) long and 30 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesSH 78
CrossesReynolds Creek
Location16.4 E. Marsing
RouteState Highway 78
CountyOwyhee County
StateIdaho
Coordinates43.35981, -116.65284
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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans3
Design loadHS 20
Structure length30 ft (9.1 m)
Longest span8 ft (2.4 m)
Deck width30 ft (9.1 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic460 (2023)
Projected traffic690 by 2042
Trucks31%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$185,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 78 over Reynolds Creek built?

It was built in 1954, making it 71 years old in 2025.

What condition is SH 78 over Reynolds 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 February 2023.

How much traffic does SH 78 over Reynolds Creek carry?

About 460 vehicles per day (2023 count), of which roughly 31% are trucks.

How long is SH 78 over Reynolds Creek?

The structure is 30 ft (9.1 m) long with a longest span of 8 ft (2.4 m) and a deck 30 ft wide.

Who owns SH 78 over Reynolds Creek?

It is owned by the State Highway Agency.