US Bridges

SH 30 over Rock Lake Creek

Fair

Grimes County, Texas · 1.45 MI W of FM 244 · Structure no. 170940021204016

Built
1958
67 years old
Condition
Fair
inspected May 2023
Type
Culvert
Concrete
Length
26 ft
3 main spans
Daily traffic
6,033
2020 count
Owner
State
State Highway Agency

About this bridge

SH 30 over Rock Lake Creek is a concrete culvert carrying SH 30 over Rock Lake Creek in Grimes County, Texas. It was built in 1958, so it is 67 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 6,033 vehicles a day, roughly 17% of them trucks, projected to reach 9,420 by 2033. The structure is 26 ft (7.9 m) long and 66 ft wide. If it were closed, the detour would be 19.3 mi (31 km).

Location

Open in Google Maps
CarriesSH 30
CrossesRock Lake Creek
Location1.45 MI W of FM 244
RouteState Highway 30
CountyGrimes County
StateTexas
Coordinates30.59954, -96.10114
Functional classRural Minor 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 protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
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 spans3
Design loadOther
Structure length26 ft (7.9 m)
Longest span8 ft (2.4 m)
Deck width66 ft (20 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,033 (2020)
Projected traffic9,420 by 2033
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.3 mi (31 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 SH 30 over Rock Lake Creek built?

It was built in 1958, making it 67 years old in 2025.

What condition is SH 30 over Rock Lake Creek 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 May 2023.

How much traffic does SH 30 over Rock Lake Creek carry?

About 6,033 vehicles per day (2020 count), of which roughly 17% are trucks.

How long is SH 30 over Rock Lake Creek?

The structure is 26 ft (7.9 m) long with a longest span of 8 ft (2.4 m) and a deck 66 ft wide.

Who owns SH 30 over Rock Lake Creek?

It is owned by the State Highway Agency.