Bridge conditions in Logan County, Colorado
182 inventoried bridges · 16 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
The federal inventory lists 182 bridges in Logan County: 69 rated good, 97 fair, and 16 poor.
- 16 of the 182 bridges in Logan County, Colorado, are rated in poor condition (8.8%) in the 2025 National Bridge Inventory, as of .
- 69 bridges (37.9%) are rated good and 97 (53.3%) fair.
- The median Logan County bridge was built in 1991.
- The busiest poor-rated bridge is I 76 Ml Ebnd over Twenty Two Slough (built 1964), carrying about 5,500 vehicles a day.
Good 37.9% · Fair 53.3% · Poor 8.8% of 182 bridges
Bridges rated poor
Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I 76 Ml Ebnd over Twenty Two Slough | 1964 | 5,500 | Poor |
| US 6 Ml Ebnd over Sterling Canal No 1 | 1941 | 2,150 | Poor |
| County Road 71 over Spring Canyon Creek | 1940 | 126 | Poor |
| CR 30.7 Vansway Dr over Sterling No 1 Ditch | 1960 | 104 | Poor |
| County Road 26 over N. Sterling Inlet Canal | 1940 | 73 | Poor |
| County Road 91 over Trib.N.Fork Frenchman Ck | 1940 | 65 | Poor |
| County Road 93 over South Platte River | 1984 | 62 | Poor |
| County Road 50 over N. Sterling Outlet Canal | 1982 | 47 | Poor |
| County Road 66 over Duck Creek | 1993 | 44 | Poor |
| County Road 48 over N. Sterling Outlet Canal | 1985 | 43 | Poor |
| County Road 52 over N. Sterling Outlet Canal | 1985 | 33 | Poor |
| County Road 70 over McCracken Draw 2 Butte | 1989 | 10 | Poor |
| County Road 52 over N. Sterling Outlet Canal | 1985 | 7 | Poor |
| County Road 59 over N. Sterling Outlet Canal | 1940 | 6 | Poor |
| County Road 83 over Duck Creek | 1993 | 3 | Poor |
| County Road 56.3 over Harmony No2 Return Canal | 1930 | – | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 6 Ml over City Streets UP RR | 1972 | 9,900 | Fair |
| US 6 Ml over South Platte R Ovflw | 1957 | 9,900 | Fair |
| US 6 Ml over Henderson-smith Ditch | 1965 | 9,900 | Fair |
| US 6 Ml over South Platte River | 1957 | 9,900 | Fair |
| US 6 Ml over South Platte R Ovflw | 1957 | 9,900 | Fair |
| I 76 Ml Wbnd over Twenty Two Slough | 1964 | 5,500 | Fair |
| I 76 Ml Ebnd over Twenty Two Slough | 1964 | 5,500 | Poor |
| I76 Ml Ebnd over SH 63 Ml | 2003 | 4,250 | Good |
| I 76 Ml Wbnd over SH 63 Ml | 2003 | 4,250 | Good |
| I 76 Ml Ebnd over County Road 14 | 2003 | 4,250 | Good |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of Colorado: Colorado bridge conditions by county · every download on the data page.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.