US Bridges

IRR Ft Mcdermitt over Quinn Rvr

Poor

Humboldt County, Nevada · Ft. Mcdermitt Indian Res. · Structure no. M1660B

Built
1976
49 years old
Condition
Poor
inspected August 2024
Type
Culvert
Steel
Length
57 ft
2 main spans
Daily traffic
55
2017 count
Owner
County
County Highway Agency

About this bridge

IRR Ft Mcdermitt over Quinn Rvr is a steel culvert carrying IRR Ft Mcdermitt over Quinn Rvr in Humboldt County, Nevada. It was built in 1976, so it is 49 years old, older than the Nevada average of 36.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 55 vehicles a day, roughly 3% of them trucks, projected to reach 61 by 2040. The structure is 57 ft (17.4 m) long and 50 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesIRR Ft Mcdermitt
CrossesQuinn Rvr
LocationFt. Mcdermitt Indian Res.
RouteFederal Lands Road 0
CountyHumboldt County
StateNevada
Coordinates41.9676, -117.62669
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionAugust 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry9: Superior to present desirable criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating19.8 US tons
Inventory rating11.8 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadHS 20
Structure length57 ft (17.4 m)
Longest span10 ft (3 m)
Deck width50 ft (15.2 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic55 (2017)
Projected traffic61 by 2040
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 IRR Ft Mcdermitt over Quinn Rvr built?

It was built in 1976, making it 49 years old in 2025.

What condition is IRR Ft Mcdermitt over Quinn Rvr in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2024.

How much traffic does IRR Ft Mcdermitt over Quinn Rvr carry?

About 55 vehicles per day (2017 count), of which roughly 3% are trucks.

How long is IRR Ft Mcdermitt over Quinn Rvr?

The structure is 57 ft (17.4 m) long with a longest span of 10 ft (3 m) and a deck 50 ft wide.

Who owns IRR Ft Mcdermitt over Quinn Rvr?

It is owned by the County Highway Agency.