Bridge conditions in Shasta County, California
493 inventoried bridges · 11 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
11 of the 493 bridges the federal inventory lists in Shasta County are rated poor; the rest split 249 good and 233 fair.
- 11 of the 493 bridges in Shasta County, California, are rated in poor condition (2.2%) in the 2025 National Bridge Inventory, as of .
- 249 bridges (50.5%) are rated good and 233 (47.3%) fair.
- The median Shasta County bridge was built in 1966.
- The busiest poor-rated bridge is Interstate 5 over Castle Creek (built 1960), carrying about 18,000 vehicles a day.
Good 50.5% · Fair 47.3% · Poor 2.2% of 493 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 |
|---|---|---|---|
| Interstate 5 over Castle Creek | 1960 | 18,000 | Poor |
| Interstate 5 over Castle Creek Road | 1960 | 18,000 | Poor |
| State Route 299 over Whiskey Creek(wskytwn Lk | 1961 | 4,050 | Poor |
| State Route 89 over Lake Britton | 1938 | 1,700 | Poor |
| Emily Rd over Anderson Creek | 1980 | 958 | Poor |
| Bridge Bay Road over Interstate 5 | 1968 | 880 | Poor |
| Sweetbrier Ave over Interstate 5 | 1962 | 400 | Poor |
| Island Road over Little Tule River | 1950 | 100 | Poor |
| Middle Creek Rd over Middle Creek | 1925 | 61 | Poor |
| Spring Creek Rd over Fall River | 1950 | 50 | Poor |
| Shotgun Creek over Unnamed Creek | 1946 | 50 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Interstate 5 NB over Balls Ferry Rd | 1966 | 78,000 | Good |
| Interstate Route 5 over UPRR Railroad Tracks | 2022 | 55,000 | Fair |
| Interstate Route 5 over Anderson Creek | 2022 | 55,000 | Good |
| Interstate 5 over Boulder Creek | 1965 | 53,000 | Fair |
| Interstate 5 over Sacramento River | 2003 | 51,000 | Good |
| State Route 44 over Sacramento River | 2010 | 51,000 | Good |
| State Route 44 over West Branch Churn Creek | 1968 | 48,500 | Good |
| State Route 44 over Clover Creek | 1968 | 48,500 | Good |
| E Cypress Ave over A.c.i.d. Canal | 1948 | 46,000 | Fair |
| Interstate 5 over Cottonwood CR UP Amtrak | 1998 | 41,000 | Fair |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of California: California 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.