US Bridges

N Zarzamora ST over Alazan Creek

Fair

Bexar County, Texas · 0.50 MI S of Lp 421 · Structure no. 150150B38345001

Built
1965
60 years old
Condition
Fair
inspected August 2023
Type
Slab
Concrete
Length
130 ft
4 main spans
Daily traffic
14,571
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

N Zarzamora ST over Alazan Creek is a concrete slab carrying N Zarzamora ST over Alazan Creek in Bexar County, Texas. It was built in 1965, so it is 60 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 5 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 14,571 vehicles a day, roughly 1% of them trucks, projected to reach 23,000 by 2039. The structure is 130 ft (39.6 m) long and 56 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesN Zarzamora ST
CrossesAlazan Creek
Location0.50 MI S of Lp 421
RouteCity Street 0
CountyBexar County
StateTexas
Coordinates29.43759, -98.52584
Functional classUrban Other Principal Arterial

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations on dry land well above flood water elevations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75 US tons
Inventory rating45 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length130 ft (39.6 m)
Longest span32 ft (9.8 m)
Deck width56 ft (17.2 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,571 (2020)
Projected traffic23,000 by 2039
Trucks1%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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$14,000
NavigationNo navigation control on waterway

Frequently asked questions

When was N Zarzamora ST over Alazan Creek built?

It was built in 1965, making it 60 years old in 2025.

What condition is N Zarzamora ST over Alazan 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 August 2023.

How much traffic does N Zarzamora ST over Alazan Creek carry?

About 14,571 vehicles per day (2020 count), of which roughly 1% are trucks.

How long is N Zarzamora ST over Alazan Creek?

The structure is 130 ft (39.6 m) long with a longest span of 32 ft (9.8 m) and a deck 56 ft wide.

Who owns N Zarzamora ST over Alazan Creek?

It is owned by the City or Municipal Highway Agency.