US Bridges

Zion RD over Mills Branch

Fair

Dallas County, Texas · 0.3 MI N of IH 30 · Structure no. 180570B17000001

Built
1962
63 years old, rebuilt 2007
Condition
Fair
inspected February 2023
Type
Culvert
Concrete
Length
49 ft
4 main spans
Daily traffic
1,419
2019 count
Owner
City
City or Municipal Highway Agency

About this bridge

Zion RD over Mills Branch is a concrete culvert carrying Zion RD over Mills Branch in Dallas County, Texas. It was built in 1962 and reconstructed in 2007, so it is 63 years old, older than the Texas average of 44.4 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 1,419 vehicles a day, projected to reach 5,300 by 2031. The structure is 49 ft (14.9 m) long and 70 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesZion RD
CrossesMills Branch
Location0.3 MI N of IH 30
RouteCity Street 0
CountyDallas County
StateTexas
Coordinates32.85786, -96.56062
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 inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44 US tons
Inventory rating26 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length49 ft (14.9 m)
Longest span10 ft (3 m)
Deck width70 ft (21.3 m)
Roadway width36 ft (10.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,419 (2019)
Projected traffic5,300 by 2031
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
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 statusPossibly eligible for the National Register; requires further investigation
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$5,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Zion RD over Mills Branch built?

It was built in 1962, making it 63 years old in 2025. It was reconstructed in 2007.

What condition is Zion RD over Mills Branch 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 February 2023.

How much traffic does Zion RD over Mills Branch carry?

About 1,419 vehicles per day (2019 count).

How long is Zion RD over Mills Branch?

The structure is 49 ft (14.9 m) long with a longest span of 10 ft (3 m) and a deck 70 ft wide.

Who owns Zion RD over Mills Branch?

It is owned by the City or Municipal Highway Agency.