US Bridges

Snowflake-Concho over Hay Hollow Wash

Good

Navajo County, Arizona · 10.6 MI E JCT SR 77 · Structure no. 09737

Built
1980
45 years old
Condition
Good
inspected May 2024
Type
Culvert
Steel
Length
58 ft
2 main spans
Daily traffic
620
2020 count
Owner
County
County Highway Agency

About this bridge

Snowflake-Concho over Hay Hollow Wash is a steel culvert carrying Snowflake-Concho over Hay Hollow Wash in Navajo County, Arizona. It was built in 1980, so it is 45 years old, younger than the Arizona average of 47.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 620 vehicles a day, roughly 5% of them trucks, projected to reach 630 by 2040. The structure is 58 ft (17.7 m) long. If it were closed, the detour would be 19.9 mi (32 km).

Location

Open in Google Maps
CarriesSnowflake-Concho
CrossesHay Hollow Wash
Location10.6 MI E JCT SR 77
RouteCounty Highway 0
CountyNavajo County
StateArizona
Coordinates34.55496, -109.91563
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating99 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadH 15
Structure length58 ft (17.7 m)
Longest span28 ft (8.5 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic620 (2020)
Projected traffic630 by 2040
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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 Snowflake-Concho over Hay Hollow Wash built?

It was built in 1980, making it 45 years old in 2025.

What condition is Snowflake-Concho over Hay Hollow Wash in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2024.

How much traffic does Snowflake-Concho over Hay Hollow Wash carry?

About 620 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is Snowflake-Concho over Hay Hollow Wash?

The structure is 58 ft (17.7 m) long with a longest span of 28 ft (8.5 m).

Who owns Snowflake-Concho over Hay Hollow Wash?

It is owned by the County Highway Agency.