US Bridges

SH 73/SH 87 NB over Cow Bayou

Poor

Orange County, Texas · 0.40 MI S of SH 62 · Structure no. 201810030601017

Built
1941
84 years old, rebuilt 2015
Condition
Poor
inspected June 2024
Type
Movable - Swing
Steel
Length
804 ft
2 main spans
Daily traffic
14,443
2022 count
Owner
State
State Highway Agency

About this bridge

SH 73/SH 87 NB over Cow Bayou is a steel movable - swing carrying SH 73/SH 87 NB over Cow Bayou in Orange County, Texas. It was built in 1941 and reconstructed in 2015, so it is 84 years old, older than the Texas average of 44.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 14,443 vehicles a day, roughly 7% of them trucks, projected to reach 19,931 by 2042. The structure is 804 ft (245.1 m) long and 32 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesSH 73/SH 87 NB
CrossesCow Bayou
Location0.40 MI S of SH 62
RouteState Highway 73
StateTexas
Coordinates30.04487, -93.82136
Functional classUrban Other Principal Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be 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 rating60 US tons
Inventory rating36 US tons

Structure

Structure typeMovable - Swing
MaterialSteel
DeckConcrete, cast-in-place
Main spans2 (+13 approach)
Design loadH 15
Structure length804 ft (245.1 m)
Longest span77 ft (23.5 m)
Deck width32 ft (9.7 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,443 (2022)
Projected traffic19,931 by 2042
Trucks7%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusListed on the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.6 million
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was SH 73/SH 87 NB over Cow Bayou built?

It was built in 1941, making it 84 years old in 2025. It was reconstructed in 2015.

What condition is SH 73/SH 87 NB over Cow Bayou in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in June 2024.

How much traffic does SH 73/SH 87 NB over Cow Bayou carry?

About 14,443 vehicles per day (2022 count), of which roughly 7% are trucks.

How long is SH 73/SH 87 NB over Cow Bayou?

The structure is 804 ft (245.1 m) long with a longest span of 77 ft (23.5 m) and a deck 32 ft wide.

Who owns SH 73/SH 87 NB over Cow Bayou?

It is owned by the State Highway Agency.