Grogans Mill RD SB over Lake Harrison
GoodMontgomery County, Texas · 2.0 MI S of Woodlands Pkw · Structure no. 121700AA0681122
- Built
- 1975
- 50 years old
- Condition
- Good
- inspected October 2023
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 79 ft
- 1 main span
- Daily traffic
- 13,300
- 2016 count
- Owner
- County
- County Highway Agency
About this bridge
Grogans Mill RD SB over Lake Harrison is a steel stringer/multi-beam or girder carrying Grogans Mill RD SB over Lake Harrison 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 13,300 vehicles a day, roughly 1% of them trucks, projected to reach 15,000 by 2033. The structure is 79 ft (24.1 m) long and 44 ft wide. If it were closed, the detour would be 6.2 mi (10 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Grogans Mill RD SB over Lake Harrison built?
It was built in 1975, making it 50 years old in 2025.
What condition is Grogans Mill RD SB over Lake Harrison in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2023.
How much traffic does Grogans Mill RD SB over Lake Harrison carry?
About 13,300 vehicles per day (2016 count), of which roughly 1% are trucks.
How long is Grogans Mill RD SB over Lake Harrison?
The structure is 79 ft (24.1 m) long with a longest span of 75 ft (22.9 m) and a deck 44 ft wide.
Who owns Grogans Mill RD SB over Lake Harrison?
It is owned by the County Highway Agency.