Mn 99 over Minnesota River
Le Sueur County, Minnesota · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Mn 99 over Minnesota River in Le Sueur County, Minnesota, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1931, making it 94 years old at the 2025 inventory.
- It carries about 5,548 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 33 of the 68 inventoried bridges in Le Sueur County rated fair (48.5%); 2 (2.9%) 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 2024, on a 12-month routine inspection cycle.
- It has fracture-critical members (NBI item 92A): steel tension members without a redundant load path, which get their own scheduled inspections.
- 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 → (44.32479, -93.95314)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 8 | 8 | Very good condition |
| Superstructure | 5 | 5 | Fair condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Continuous steel through truss |
| Length | about 402 ft |
| Location | In St Peter |
| NBI structure number | 4930 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | May 2024 |
| Inspection interval (item 91) | 12 months |
| Scour (item 113) | 4: foundations stable, field review says exposed foundations need protection |
| Fracture critical (item 92A) | Yes |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Minnesota department of transportation.
Busiest bridges in Le Sueur County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 169 over US 169 Ramps; UP RR | 1996 | 14,500 | Fair |
| Mn 22 over Shanaska Creek | 1999 | 12,472 | Good |
| Mn 22 over Minnesota River | 1998 | 11,436 | Fair |
| Mn 22 over Minnesota River | 2015 | 11,436 | Good |
| Mn 19 over Sand Creek | 1954 | 6,395 | Poor |
| Mn 13 over Co Ditch # 62 | 1995 | 6,360 | Good |
All bridges nearby: Le Sueur County, MN bridge conditions · every bridge in Le Sueur County · Minnesota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.