US Bridges

Irr# US 84 Ml over Little Navajo River

Fair

Archuleta County, Colorado · Chromo 4.7 MI N of Nm · Structure no. P-09-E

Built
1938
87 years old
Condition
Fair
inspected May 2023
Type
Culvert
Concrete
Length
24 ft
2 main spans
Daily traffic
1,100
2020 count
Owner
State
State Highway Agency

About this bridge

Irr# US 84 Ml over Little Navajo River is a concrete culvert carrying Irr# US 84 Ml over Little Navajo River in Archuleta County, Colorado. It was built in 1938, so it is 87 years old, older than the Colorado average of 42.2 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 1,100 vehicles a day, roughly 8% of them trucks, projected to reach 1,133 by 2040. The structure is 24 ft (7.4 m) long and 45 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesIrr# US 84 Ml
CrossesLittle Navajo River
LocationChromo 4.7 MI N of Nm
RouteU.S. Route 84A
Coordinates37.037, -106.84362
Functional classRural Minor 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.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating83.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadH 15
Structure length24 ft (7.4 m)
Longest span11 ft (3.5 m)
Deck width45 ft (13.7 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,100 (2020)
Projected traffic1,133 by 2040
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 Irr# US 84 Ml over Little Navajo River built?

It was built in 1938, making it 87 years old in 2025.

What condition is Irr# US 84 Ml over Little Navajo River 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 May 2023.

How much traffic does Irr# US 84 Ml over Little Navajo River carry?

About 1,100 vehicles per day (2020 count), of which roughly 8% are trucks.

How long is Irr# US 84 Ml over Little Navajo River?

The structure is 24 ft (7.4 m) long with a longest span of 11 ft (3.5 m) and a deck 45 ft wide.

Who owns Irr# US 84 Ml over Little Navajo River?

It is owned by the State Highway Agency.