US Bridges

Irr# CO RD 359 over Navajo River

Fair

Archuleta County, Colorado · 4.2 MI SW of Chromo · Structure no. AR359-S7.6-S84A

Built
1994
31 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
104 ft
1 main span
Daily traffic
327
2022 count
Owner
County
County Highway Agency

About this bridge

Irr# CO RD 359 over Navajo River is a prestressed concrete stringer/multi-beam or girder carrying Irr# CO RD 359 over Navajo River in Archuleta County, Colorado. It was built in 1994, so it is 31 years old, younger 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 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 327 vehicles a day, projected to reach 386 by 2042. The structure is 104 ft (31.7 m) long and 31 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

CarriesIrr# CO RD 359
CrossesNavajo River
Location4.2 MI SW of Chromo
RouteCounty Highway 0
Coordinates37.00299, -106.90628
Functional classRural Minor Collector

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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating56.1 US tons
Inventory rating33.6 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length104 ft (31.7 m)
Longest span99 ft (30.2 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic327 (2022)
Projected traffic386 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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# CO RD 359 over Navajo River built?

It was built in 1994, making it 31 years old in 2025.

What condition is Irr# CO RD 359 over 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 October 2024.

How much traffic does Irr# CO RD 359 over Navajo River carry?

About 327 vehicles per day (2022 count).

How long is Irr# CO RD 359 over Navajo River?

The structure is 104 ft (31.7 m) long with a longest span of 99 ft (30.2 m) and a deck 31 ft wide.

Who owns Irr# CO RD 359 over Navajo River?

It is owned by the County Highway Agency.