US Bridges

Grogans Mill RD NB over Drainage Ditch

Fair

Montgomery County, Texas · 0.8 MI W of IH 45 · Structure no. 121700AA0681126

Built
1978
47 years old
Condition
Fair
inspected October 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
78 ft
1 main span
Daily traffic
20,000
2013 count
Owner
County
County Highway Agency

About this bridge

Grogans Mill RD NB over Drainage Ditch is a prestressed concrete box beam or girders - multiple carrying Grogans Mill RD NB over Drainage Ditch in Montgomery County, Texas. It was built in 1978, so it is 47 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 20,000 vehicles a day, roughly 2% of them trucks, projected to reach 30,000 by 2033. The structure is 78 ft (23.8 m) long and 35 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesGrogans Mill RD NB
CrossesDrainage Ditch
Location0.8 MI W of IH 45
RouteCounty Highway 0
CountyMontgomery County
StateTexas
Coordinates30.12844, -95.45639
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
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 typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length78 ft (23.8 m)
Longest span75 ft (22.9 m)
Deck width35 ft (10.6 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,000 (2013)
Projected traffic30,000 by 2033
Trucks2%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$5,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Grogans Mill RD NB over Drainage Ditch built?

It was built in 1978, making it 47 years old in 2025.

What condition is Grogans Mill RD NB over Drainage Ditch 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 October 2023.

How much traffic does Grogans Mill RD NB over Drainage Ditch carry?

About 20,000 vehicles per day (2013 count), of which roughly 2% are trucks.

How long is Grogans Mill RD NB over Drainage Ditch?

The structure is 78 ft (23.8 m) long with a longest span of 75 ft (22.9 m) and a deck 35 ft wide.

Who owns Grogans Mill RD NB over Drainage Ditch?

It is owned by the County Highway Agency.