US Bridges

SR612 Nellis Bl over Monson Chnl

Fair

Clark County, Nevada · Las Vegas · Structure no. B1570

Built
1976
49 years old
Condition
Fair
inspected November 2023
Type
Culvert
Concrete
Length
23 ft
3 main spans
Daily traffic
35,500
2017 count
Owner
State
State Highway Agency

About this bridge

SR612 Nellis Bl over Monson Chnl is a concrete culvert carrying SR612 Nellis Bl over Monson Chnl in Clark 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 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 35,500 vehicles a day, roughly 7% of them trucks, projected to reach 73,418 by 2040. The structure is 23 ft (7 m) long and 100 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesSR612 Nellis Bl
CrossesMonson Chnl
LocationLas Vegas
RouteState Highway 612
StateNevada
Coordinates36.11473, -115.06455
Functional classUrban Other Principal Arterial

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 protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51.8 US tons
Inventory rating31.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20 + Mod
Structure length23 ft (7 m)
Longest span7 ft (2.1 m)
Deck width100 ft (30.5 m)
Roadway width88 ft (26.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35,500 (2017)
Projected traffic73,418 by 2040
Trucks7%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 SR612 Nellis Bl over Monson Chnl built?

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

What condition is SR612 Nellis Bl over Monson Chnl 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 November 2023.

How much traffic does SR612 Nellis Bl over Monson Chnl carry?

About 35,500 vehicles per day (2017 count), of which roughly 7% are trucks.

How long is SR612 Nellis Bl over Monson Chnl?

The structure is 23 ft (7 m) long with a longest span of 7 ft (2.1 m) and a deck 100 ft wide.

Who owns SR612 Nellis Bl over Monson Chnl?

It is owned by the State Highway Agency.