US Bridges

Snowflake-Concho over Silver Creek

Fair

Navajo County, Arizona · 0.6 MI E JCT SR 77 · Structure no. 09573

Built
1972
53 years old
Condition
Fair
inspected May 2024
Type
Slab
Concrete Continuous
Length
167 ft
4 main spans
Daily traffic
3,466
2021 count
Owner
County
County Highway Agency

About this bridge

Snowflake-Concho over Silver Creek is a concrete continuous slab carrying Snowflake-Concho over Silver Creek in Navajo County, Arizona. It was built in 1972, so it is 53 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 3,466 vehicles a day, roughly 5% of them trucks, projected to reach 3,476 by 2041. The structure is 167 ft (50.9 m) long and 32 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSnowflake-Concho
CrossesSilver Creek
Location0.6 MI E JCT SR 77
RouteCounty Highway 0
CountyNavajo County
StateArizona
Coordinates34.51339, -110.06905
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 rating47 US tons
Inventory rating28 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length167 ft (50.9 m)
Longest span45 ft (13.7 m)
Deck width32 ft (9.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,466 (2021)
Projected traffic3,476 by 2041
Trucks5%
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

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$2.4 million (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Snowflake-Concho over Silver Creek built?

It was built in 1972, making it 53 years old in 2025.

What condition is Snowflake-Concho over Silver Creek 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 2024.

How much traffic does Snowflake-Concho over Silver Creek carry?

About 3,466 vehicles per day (2021 count), of which roughly 5% are trucks.

How long is Snowflake-Concho over Silver Creek?

The structure is 167 ft (50.9 m) long with a longest span of 45 ft (13.7 m) and a deck 32 ft wide.

Who owns Snowflake-Concho over Silver Creek?

It is owned by the County Highway Agency.