US Bridges

SH 105 over Four Mile CR

Fair

Montgomery County, Texas · 0.02 MI W of FM 1485 · Structure no. 121700033804056

Built
1936
89 years old, rebuilt 1987
Condition
Fair
inspected October 2024
Type
Culvert
Concrete
Length
39 ft
5 main spans
Daily traffic
23,150
2020 count
Owner
State
State Highway Agency

About this bridge

SH 105 over Four Mile CR is a concrete culvert carrying SH 105 over Four Mile CR in Montgomery County, Texas. It was built in 1936 and reconstructed in 1987, so it is 89 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 23,150 vehicles a day, roughly 7% of them trucks, projected to reach 26,390 by 2033. The structure is 39 ft (11.9 m) long and 69 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesSH 105
CrossesFour Mile CR
Location0.02 MI W of FM 1485
RouteState Highway 105
CountyMontgomery County
StateTexas
Coordinates30.3244, -95.39775
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
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 rating44 US tons
Inventory rating26 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans5
Design loadH 15
Structure length39 ft (11.9 m)
Longest span7 ft (2.1 m)
Deck width69 ft (21 m)
Roadway width54 ft (16.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic23,150 (2020)
Projected traffic26,390 by 2033
Trucks7%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 km)
TollOn a free road
National Highway SystemYes

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 SH 105 over Four Mile CR built?

It was built in 1936, making it 89 years old in 2025. It was reconstructed in 1987.

What condition is SH 105 over Four Mile CR 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 2024.

How much traffic does SH 105 over Four Mile CR carry?

About 23,150 vehicles per day (2020 count), of which roughly 7% are trucks.

How long is SH 105 over Four Mile CR?

The structure is 39 ft (11.9 m) long with a longest span of 7 ft (2.1 m) and a deck 69 ft wide.

Who owns SH 105 over Four Mile CR?

It is owned by the State Highway Agency.