31ST St over Drainage Area
Morton County, North Dakota · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- 31ST St over Drainage Area in Morton County, North Dakota, 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 1972, making it 53 years old at the 2025 inventory.
- It carries about 10 vehicles a day (traffic count year 2018).
- Its listed owner is the county highway agency.
- It is one of 128 of the 269 inventoried bridges in Morton County rated fair (47.6%); 26 (9.7%) are rated poor.
- Its traffic status in the 2025 inventory is posted for load (NBI item 41).
- Its class is unchanged from 2024 (fair), but component ratings moved: deck 6 to 5, superstructure 5 to 6.
- Its most recent inspection on record is dated November 2024, on a 24-month routine inspection cycle.
- 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 → (46.96364, -101.62486)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 5 | Fair condition |
| Superstructure | 5 | 6 | Satisfactory condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Timber stringer or multi-beam girder |
| Length | about 37 ft |
| Location | 10 West 8 North New Salem |
| NBI structure number | 000000030123011 |
| Condition class | Fair |
| Traffic status (item 41) | Posted for load |
| Last inspection (item 90) | November 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | U: unknown foundation, not evaluated for scour |
Source: FHWA National Bridge Inventory, 2025 data as reported by the North Dakota department of transportation.
Busiest bridges in Morton County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Interstate 94 over Missouri River | 1965 | 24,125 | Fair |
| Interstate 194 over Business Loop 94 | 1981 | 18,200 | Fair |
| I-94 Business Loop over West Midway Separation | 1965 | 16,750 | Fair |
| Interstate 94 over East Midway Interchange | 1965 | 9,100 | Fair |
| Interstate 194 over Business 94 | 1981 | 9,100 | Fair |
| Interstate 194 over Business 94 | 1981 | 9,100 | Fair |
All bridges nearby: Morton County, ND bridge conditions · every bridge in Morton County · North Dakota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.