US Bridges

Sitgreaves ST over Rio De Flag

Fair

Coconino County, Arizona · Sitgreaves @ Dale · Structure no. 08611

Built
1900
125 years old
Condition
Fair
inspected July 2023
Type
Culvert
Concrete Continuous
Length
29 ft
2 main spans
Daily traffic
310
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Sitgreaves ST over Rio De Flag is a concrete continuous culvert carrying Sitgreaves ST over Rio De Flag in Coconino County, Arizona. It was built in 1900, so it is 125 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 310 vehicles a day, roughly 1% of them trucks, projected to reach 320 by 2042. The structure is 29 ft (8.8 m) long and 50 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSitgreaves ST
CrossesRio De Flag
LocationSitgreaves @ Dale
RouteCity Street 0
CountyCoconino County
StateArizona
Coordinates35.20255, -111.65184
Functional classUrban Local

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 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry8: Equal to present desirable criteria
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 length29 ft (8.8 m)
Longest span12 ft (3.7 m)
Deck width50 ft (15.2 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic310 (2022)
Projected traffic320 by 2042
Trucks1%
Lanes on structure2
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 Sitgreaves ST over Rio De Flag built?

It was built in 1900, making it 125 years old in 2025.

What condition is Sitgreaves 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 2023.

How much traffic does Sitgreaves ST over Rio De Flag carry?

About 310 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is Sitgreaves ST over Rio De Flag?

The structure is 29 ft (8.8 m) long with a longest span of 12 ft (3.7 m) and a deck 50 ft wide.

Who owns Sitgreaves ST over Rio De Flag?

It is owned by the City or Municipal Highway Agency.