SR 18 EB over Mississinewa River
Grant County, Indiana · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- SR 18 EB over Mississinewa River in Grant County, Indiana, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1983, making it 42 years old at the 2025 inventory.
- It carries about 4,641 vehicles a day (traffic count year 2020).
- Its listed owner is the state highway agency.
- It is one of 167 of the 280 inventoried bridges in Grant County rated fair (59.6%); 4 (1.4%) 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 July 2023, on a 24-month routine inspection cycle.
- It is coded scour critical (NBI item 113 = 3): scour critical: foundations unstable for the assessed or calculated scour.
- A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.
View this bridge on a map → (40.55676, -85.64712)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 5 | 5 | Fair condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 381 ft |
| Location | 01.53 E SR 9 |
| NBI structure number | 004845 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | July 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 3: scour critical: foundations unstable for the assessed or calculated scour |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Indiana department of transportation.
Busiest bridges in Grant County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Wheeling Pike over Barren Creek | 1940 | 57,630 | Fair |
| I-69 NB over SR 18 Eb/wb | 2019 | 31,070 | Good |
| SR 9 over NS RR Trail | 1940 | 23,655 | Good |
| SR 9 over Boots Creek | 1999 | 22,538 | Fair |
| US 35 SR 22 over Mississinewa River | 1964 | 16,102 | Fair |
| I-69 SB over NS RR CR 450 N | 1963 | 15,649 | Good |
All bridges nearby: Grant County, IN bridge conditions · every bridge in Grant County · Indiana bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.