US Bridges

San Francisco ST over Rio De Flag

Fair

Coconino County, Arizona · 0.3 MI S of JCT US 66 · Structure no. 08712

Built
1959
66 years old
Condition
Fair
inspected July 2021
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
5,711
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

San Francisco ST over Rio De Flag is a concrete continuous culvert carrying San Francisco ST over Rio De Flag in Coconino County, Arizona. It was built in 1959, so it is 66 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 5,711 vehicles a day, roughly 1% of them trucks, projected to reach 5,721 by 2041. The structure is 21 ft (6.4 m) long and 50 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesSan Francisco ST
CrossesRio De Flag
Location0.3 MI S of JCT US 66
RouteCity Street 0
CountyCoconino County
StateArizona
Coordinates35.1931, -111.65
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 protection7 GoodSome minor problems.
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating35.1 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length21 ft (6.4 m)
Longest span10 ft (3 m)
Deck width50 ft (15.3 m)
Roadway width37 ft (11.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,711 (2021)
Projected traffic5,721 by 2041
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 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 San Francisco ST over Rio De Flag built?

It was built in 1959, making it 66 years old in 2025.

What condition is San Francisco ST 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 San Francisco ST over Rio De Flag carry?

About 5,711 vehicles per day (2021 count), of which roughly 1% are trucks.

How long is San Francisco ST over Rio De Flag?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m) and a deck 50 ft wide.

Who owns San Francisco ST over Rio De Flag?

It is owned by the City or Municipal Highway Agency.