US Bridges

IH 37 SB over FM 1099 & Drain

Good

Atascosa County, Texas · 1.80 MI S of FM 791 · Structure no. 150070007306173

Built
1976
49 years old
Condition
Good
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
270 ft
1 main span
Daily traffic
13,046
2019 count
Owner
State
State Highway Agency

About this bridge

IH 37 SB over FM 1099 & Drain is a prestressed concrete stringer/multi-beam or girder carrying IH 37 SB over FM 1099 & Drain in Atascosa County, Texas. It was built in 1976, so it is 49 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 13,046 vehicles a day, roughly 29% of them trucks, projected to reach 14,430 by 2033. The structure is 270 ft (82.3 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesIH 37 SB
CrossesFM 1099 & Drain
Location1.80 MI S of FM 791
RouteInterstate 37
StateTexas
Coordinates28.73351, -98.28934
Functional classRural Principal Arterial - Interstate

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation7: Better than present minimum criteria
Deck geometry8: Equal to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1 (+4 approach)
Design loadHS 20
Structure length270 ft (82.3 m)
Longest span70 ft (21.3 m)
Deck width44 ft (13.5 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,046 (2019)
Projected traffic14,430 by 2033
Trucks29%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 IH 37 SB over FM 1099 & Drain built?

It was built in 1976, making it 49 years old in 2025.

What condition is IH 37 SB over FM 1099 & Drain 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 IH 37 SB over FM 1099 & Drain carry?

About 13,046 vehicles per day (2019 count), of which roughly 29% are trucks.

How long is IH 37 SB over FM 1099 & Drain?

The structure is 270 ft (82.3 m) long with a longest span of 70 ft (21.3 m) and a deck 44 ft wide.

Who owns IH 37 SB over FM 1099 & Drain?

It is owned by the State Highway Agency.