US Bridges

Fremont Boulevard over Rio De Flag

Fair

Coconino County, Arizona · 0.4 MI S of US180 · Structure no. 08606

Built
1970
55 years old
Condition
Fair
inspected July 2021
Type
Culvert
Steel
Length
38 ft
4 main spans
Daily traffic
3,409
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

Fremont Boulevard over Rio De Flag is a steel culvert carrying Fremont Boulevard over Rio De Flag in Coconino County, Arizona. It was built in 1970, so it is 55 years old, older than the Arizona average of 47.8 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 3,409 vehicles a day, roughly 1% of them trucks, projected to reach 3,419 by 2041. The structure is 38 ft (11.6 m) long and 80 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesFremont Boulevard
CrossesRio De Flag
Location0.4 MI S of US180
RouteCity Street 0
CountyCoconino County
StateArizona
Coordinates35.234, -111.6691
Functional classUrban 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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2021
Inspection intervalevery 48 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckOther
Main spans4
Design loadHS 20
Structure length38 ft (11.6 m)
Longest span7 ft (2.1 m)
Deck width80 ft (24.4 m)
Roadway width64 ft (19.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,409 (2021)
Projected traffic3,419 by 2041
Trucks1%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Fremont Boulevard over Rio De Flag built?

It was built in 1970, making it 55 years old in 2025.

What condition is Fremont Boulevard over Rio De Flag 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 July 2021.

How much traffic does Fremont Boulevard over Rio De Flag carry?

About 3,409 vehicles per day (2021 count), of which roughly 1% are trucks.

How long is Fremont Boulevard over Rio De Flag?

The structure is 38 ft (11.6 m) long with a longest span of 7 ft (2.1 m) and a deck 80 ft wide.

Who owns Fremont Boulevard over Rio De Flag?

It is owned by the City or Municipal Highway Agency.