I-75 over M-9109 Mt Zion Road
Clayton County, Georgia · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- I-75 over M-9109 Mt Zion Road in Clayton County, Georgia, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
- It was built in 1969 and reconstructed in 1991, making it 56 years old at the 2025 inventory.
- It carries about 149,000 vehicles a day (traffic count year 2024).
- Its listed owner is the state highway agency.
- It is one of 138 of the 168 inventoried bridges in Clayton County rated good (82.1%); 2 (1.2%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated May 2023, on a 24-month routine inspection cycle.
- A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.
View this bridge on a map → (33.55956, -84.31113)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 440 ft |
| Location | 1.75 Mi N of Henry Co Lin |
| NBI structure number | 000000006300310 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | May 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | N: not over a waterway |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Georgia department of transportation.
Busiest bridges in Clayton County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-285 over Sullivan Creek | 1959 | 186,000 | Good |
| 10-28 Run (nlvr) over I-285 | 2006 | 186,000 | Good |
| I-75 over Jester Creek Trib. | 1965 | 174,000 | Good |
| I-75 over Jester Creek | 1965 | 174,000 | Good |
| I-75 over CR 332 Holiday Boulevard | 1965 | 174,000 | Good |
| I-75 over Jester Creek Trib. | 1965 | 174,000 | Good |
All bridges nearby: Clayton County, GA bridge conditions · every bridge in Clayton County · Georgia bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.