US Bridges

SH 29 over Iron Branch

Good

Llano County, Texas · 7.2 MI E of SH 16 · Structure no. 141500015004030

Built
1942
83 years old, rebuilt 2022
Condition
Good
inspected May 2023
Type
Culvert
Concrete
Length
23 ft
2 main spans
Daily traffic
5,276
2020 count
Owner
State
State Highway Agency

About this bridge

SH 29 over Iron Branch is a concrete culvert carrying SH 29 over Iron Branch in Llano County, Texas. It was built in 1942 and reconstructed in 2022, so it is 83 years old, older than the Texas average of 44.4 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 5,276 vehicles a day, roughly 9% of them trucks, projected to reach 4,918 by 2039. The structure is 23 ft (7 m) long and 43 ft wide.

Location

Open in Google Maps
CarriesSH 29
CrossesIron Branch
Location7.2 MI E of SH 16
RouteState Highway 29
CountyLlano County
StateTexas
Coordinates30.78086, -98.56184
Functional classRural Minor Arterial

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 protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44 US tons
Inventory rating26 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadH 15
Structure length23 ft (7 m)
Longest span10 ft (3 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,276 (2020)
Projected traffic4,918 by 2039
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 29 over Iron Branch built?

It was built in 1942, making it 83 years old in 2025. It was reconstructed in 2022.

What condition is SH 29 over Iron Branch 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 2023.

How much traffic does SH 29 over Iron Branch carry?

About 5,276 vehicles per day (2020 count), of which roughly 9% are trucks.

How long is SH 29 over Iron Branch?

The structure is 23 ft (7 m) long with a longest span of 10 ft (3 m) and a deck 43 ft wide.

Who owns SH 29 over Iron Branch?

It is owned by the State Highway Agency.