Bridge conditions in Larimer County, Colorado
562 inventoried bridges · 12 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
The federal inventory lists 562 bridges in Larimer County: 275 rated good, 275 fair, and 12 poor.
- 12 of the 562 bridges in Larimer County, Colorado, are rated in poor condition (2.1%) in the 2025 National Bridge Inventory, as of .
- 275 bridges (48.9%) are rated good and 275 (48.9%) fair.
- The median Larimer County bridge was built in 1988.
- The busiest poor-rated bridge is SH 392 Ml over Cache La Poudre River (built 1959), carrying about 19,000 vehicles a day.
Good 48.9% · Fair 48.9% · Poor 2.1% of 562 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 |
|---|---|---|---|
| SH 392 Ml over Cache La Poudre River | 1959 | 19,000 | Poor |
| US 34 Ml Wbnd over Barnes Inlet Canal | 1933 | 12,500 | Poor |
| Lincoln Avenue over Dry Creek | 1948 | 6,817 | Poor |
| East Vine Drive over Lake Canal | 1950 | 6,025 | Poor |
| US 34 Ml over Devils Gulch | 1937 | 6,000 | Poor |
| CR 17 (N Shields S over Terry Lake Inlet Canal | 1962 | 4,595 | Poor |
| US 287 Ml over Dale Creek | 1958 | 3,900 | Poor |
| County Road 40 over Fossil Creek Res. Inlet | 1969 | 1,627 | Poor |
| Monroe Avenue over Greeley Loveland Canal | 1922 | 473 | Poor |
| County Road 56 over Larimer County Canal | 1930 | 91 | Poor |
| County Road 63E over Little Beaver Creek | 1972 | 86 | Poor |
| County Road 45E over Dale Creek | 1932 | 16 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I25 Ml Nbnd over Poudre River Floodplain | 2022 | 90,000 | Good |
| I25 Ml Sbnd over Poudre River Floodplain | 2023 | 90,000 | Good |
| I 25 Ml over Hillsboro Tributary | 2020 | 86,000 | Good |
| I 25 Ml Nbnd over County Road 16 | 2022 | 86,000 | Good |
| I 25 Ml Sbnd over County Road 16 | 2023 | 86,000 | Good |
| SH 402 Ml over I25 Ml | 2020 | 86,000 | Good |
| I 25 Ml over Cache La Poudre Ditch | 1966 | 55,000 | Fair |
| I 25 Ml over Lake Canal | 1966 | 55,000 | Fair |
| I 25 Ml over Box Elder Creek | 1968 | 55,000 | Fair |
| Harmony RD/OLDSH68 over I 25 Ml | 1999 | 54,909 | 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.