US Bridges

SR 208/TOPAZ RD over W. Walker River Overflow

Good

Lyon County, Nevada · South of Yerington · Structure no. B 147

Built
1931
94 years old
Condition
Good
inspected April 2023
Type
Culvert
Concrete
Length
23 ft
2 main spans
Daily traffic
340
2017 count
Owner
State
State Highway Agency

About this bridge

SR 208/TOPAZ RD over W. Walker River Overflow is a concrete culvert carrying SR 208/TOPAZ RD over W. Walker River Overflow in Lyon County, Nevada. It was built in 1931, so it is 94 years old, older than the Nevada average of 36.4 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 340 vehicles a day, roughly 6% of them trucks, projected to reach 400 by 2040. The structure is 23 ft (7 m) long and 30 ft wide. If it were closed, the detour would be 23 mi (37 km).

CarriesSR 208/TOPAZ RD
CrossesW. Walker River Overflow
LocationSouth of Yerington
RouteState Highway 208
StateNevada
Coordinates38.83281, -119.18842
Functional classRural Major Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionApril 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
Deck geometry5: 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 rating36 US tons
Inventory rating21.6 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadUnknown
Structure length23 ft (7 m)
Longest span10 ft (3 m)
Deck width30 ft (9.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic340 (2017)
Projected traffic400 by 2040
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed23 mi (37 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 208/TOPAZ RD over W. Walker River Overflow built?

It was built in 1931, making it 94 years old in 2025.

What condition is SR 208/TOPAZ RD over W. Walker River Overflow 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 April 2023.

How much traffic does SR 208/TOPAZ RD over W. Walker River Overflow carry?

About 340 vehicles per day (2017 count), of which roughly 6% are trucks.

How long is SR 208/TOPAZ RD over W. Walker River Overflow?

The structure is 23 ft (7 m) long with a longest span of 10 ft (3 m) and a deck 30 ft wide.

Who owns SR 208/TOPAZ RD over W. Walker River Overflow?

It is owned by the State Highway Agency.