T 15 over Marsh Creek (jd # 91)
Mahnomen County, Minnesota · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- T 15 over Marsh Creek (jd # 91) in Mahnomen County, Minnesota, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1978, making it 47 years old at the 2025 inventory.
- It carries about 7 vehicles a day (traffic count year 1986).
- Its listed owner is a town or township highway agency.
- It is one of 11 of the 40 inventoried bridges in Mahnomen County rated fair (27.5%); 2 (5.0%) are rated poor.
- 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 → (47.45803, -95.93317)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 5 | Fair condition |
Bridge details
| Structure | Steel culvert |
| Length | about 33 ft |
| Location | 1.2 Mi N of Jct Csah 1 |
| NBI structure number | L9837 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Minnesota department of transportation.
Busiest bridges in Mahnomen County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 59 over Wild Rice River | 1979 | 3,950 | Fair |
| Mn 200 over Wild Rice River | 1973 | 1,507 | Good |
| Mn 200 over Twin Lakes Creek | 2022 | 1,213 | Good |
| Mn 113 over White Earth River | 1977 | 1,093 | Good |
| Mn 200 over Marsh River | 2003 | 849 | Good |
| Csah 10 over Wild Rice River | 2005 | 670 | Good |
All bridges nearby: Mahnomen County, MN bridge conditions · every bridge in Mahnomen County · Minnesota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.