US Bridges

FM 1841 over Black Bayou

Fair

Cass County, Texas · 2.75 MI N of FM 251 · Structure no. 190340233902002

Built
1961
64 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Concrete
Length
243 ft
8 main spans
Daily traffic
215
2020 count
Owner
State
State Highway Agency

About this bridge

FM 1841 over Black Bayou is a concrete stringer/multi-beam or girder carrying FM 1841 over Black Bayou in Cass County, Texas. It was built in 1961, so it is 64 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 215 vehicles a day, roughly 14% of them trucks, projected to reach 380 by 2033. The structure is 243 ft (74 m) long and 26 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesFM 1841
CrossesBlack Bayou
Location2.75 MI N of FM 251
RouteState Highway 1841
CountyCass County
StateTexas
Coordinates33.03791, -94.12617
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61 US tons
Inventory rating36.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete
DeckConcrete, cast-in-place
Main spans8
Design loadH 15
Structure length243 ft (74 m)
Longest span30 ft (9.2 m)
Deck width26 ft (7.8 m)
Roadway width23 ft (6.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic215 (2020)
Projected traffic380 by 2033
Trucks14%
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

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 FM 1841 over Black Bayou built?

It was built in 1961, making it 64 years old in 2025.

What condition is FM 1841 over Black Bayou 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 September 2024.

How much traffic does FM 1841 over Black Bayou carry?

About 215 vehicles per day (2020 count), of which roughly 14% are trucks.

How long is FM 1841 over Black Bayou?

The structure is 243 ft (74 m) long with a longest span of 30 ft (9.2 m) and a deck 26 ft wide.

Who owns FM 1841 over Black Bayou?

It is owned by the State Highway Agency.