81ST Street North over Outlet Channel of Marsh
McHenry County, North Dakota · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- 81ST Street North over Outlet Channel of Marsh in McHenry County, North Dakota, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 8 (very good condition) on the 0-9 scale.
- It was built in 2010, making it 15 years old at the 2025 inventory.
- It carries about 40 vehicles a day (traffic count year 2022).
- It is one of 23 of the 112 inventoried bridges in McHenry County rated good (20.5%); 34 (30.4%) 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 2022, 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 → (48.58933, -100.59533)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Culvert | 8 | 8 | Very good condition |
Bridge details
| Structure | Concrete culvert |
| Length | about 22 ft |
| Location | SE 1/4 Sec 15 T159N R77W |
| NBI structure number | 000062620-58577 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | July 2022 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
Source: FHWA National Bridge Inventory, 2025 data as reported by the North Dakota department of transportation.
Busiest bridges in McHenry County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US Highway 2 over Creek | 1936 | 2,700 | Fair |
| US Highway 2 over Creek | 1936 | 2,700 | Good |
| US Highway 52 over Oak Creek | 1947 | 2,370 | Fair |
| US Highway 52 over Bonnes Coulee | 1947 | 2,360 | Good |
| US Highway 52 over Creek | 2001 | 1,400 | Good |
| US Highway 2 over Mouse River | 1979 | 1,275 | Good |
All bridges nearby: McHenry County, ND bridge conditions · every bridge in McHenry County · North Dakota bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.