US Bridges

Rowland Road over Marys Creek

Fair

Owyhee County, Idaho · 4.5 S. 3.0 E. Grasmere · Structure no. 000000000028265

Built
1988
37 years old
Condition
Fair
inspected June 2024
Type
Tee Beam
Prestressed Concrete
Length
33 ft
1 main span
Daily traffic
5
2023 count
Owner
County
County Highway Agency

About this bridge

Rowland Road over Marys Creek is a prestressed concrete tee beam carrying Rowland Road over Marys Creek in Owyhee County, Idaho. It was built in 1988, so it is 37 years old, younger 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 6 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 5 vehicles a day, roughly 10% of them trucks, projected to reach 8 by 2039. The structure is 33 ft (10.1 m) long and 20 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesRowland Road
CrossesMarys Creek
Location4.5 S. 3.0 E. Grasmere
RouteCounty Highway 0
StateIdaho
Coordinates42.31211, -115.82747
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating44.6 US tons
Inventory rating32.7 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length33 ft (10.1 m)
Longest span30 ft (9.1 m)
Deck width20 ft (6.1 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5 (2023)
Projected traffic8 by 2039
Trucks10%
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

OwnerCounty Highway Agency
Maintained byCounty 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 Rowland Road over Marys Creek built?

It was built in 1988, making it 37 years old in 2025.

What condition is Rowland Road over Marys 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 June 2024.

How much traffic does Rowland Road over Marys Creek carry?

About 5 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Rowland Road over Marys Creek?

The structure is 33 ft (10.1 m) long with a longest span of 30 ft (9.1 m) and a deck 20 ft wide.

Who owns Rowland Road over Marys Creek?

It is owned by the County Highway Agency.