US Bridges

Calvary RD over Lake Conroe

Fair

Montgomery County, Texas · 4.54 MI W of IH 45 · Structure no. 121700AA0287001

Built
1975
50 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Concrete
Length
200 ft
5 main spans
Daily traffic
1,081
2016 count
Owner
County
County Highway Agency

About this bridge

Calvary RD over Lake Conroe is a concrete stringer/multi-beam or girder carrying Calvary RD over Lake Conroe in Montgomery County, Texas. It was built in 1975, so it is 50 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 1,081 vehicles a day, roughly 3% of them trucks, projected to reach 700 by 2034. The structure is 200 ft (61 m) long and 28 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesCalvary RD
CrossesLake Conroe
Location4.54 MI W of IH 45
RouteCounty Highway 0
CountyMontgomery County
StateTexas
Coordinates30.47353, -95.56937
Functional classRural Local

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 protection7 GoodSome minor problems.
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating27 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete
DeckConcrete, cast-in-place
Main spans5
Design loadUnknown
Structure length200 ft (61 m)
Longest span40 ft (12.2 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,081 (2016)
Projected traffic700 by 2034
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Calvary RD over Lake Conroe built?

It was built in 1975, making it 50 years old in 2025.

What condition is Calvary RD over Lake Conroe 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 Calvary RD over Lake Conroe carry?

About 1,081 vehicles per day (2016 count), of which roughly 3% are trucks.

How long is Calvary RD over Lake Conroe?

The structure is 200 ft (61 m) long with a longest span of 40 ft (12.2 m) and a deck 28 ft wide.

Who owns Calvary RD over Lake Conroe?

It is owned by the County Highway Agency.