Shasta County, CA

500 public highway bridges

Shasta County Bridge Snapshot

Shasta County, California contains 500 public highway bridges in the FHWA National Bridge Inventory. Roughly 41.2% are rated “Good,” 44.6% “Fair,” 2% “Poor,” and 2% are classified as structurally deficient — the federal designation for spans whose deck, superstructure, or substructure has been rated 4 or below on the 0–9 NBI scale. Structurally deficient does not mean unsafe to cross; it means the bridge is on the priority list for repair or replacement.

Inspections in CA are conducted by certified engineers from the state Department of Transportation on a 24-month cycle, and results are reported back to the FHWA each spring. The list below shows every NBI-tracked bridge in the county, sorted by inventory load rating. Use the “Sort by” controls to surface the lowest-rated spans first, and click any row for full inspection history, traffic counts, and condition trends.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

500

Total Bridges

41.2%

Good

2%

Poor

2%

Structurally Deficient

Condition Distribution

Good

41.2% (206)

Fair

44.6% (223)

Poor

2% (10)

SD

2% (10)

All Bridges (500)

Sort:

UP RR & AMTRAK

Over: STATE ROUTE 273

02-SHA-273-14.77-RDG, Shasta, CA

Built 1938 ADT: 23,000

UNION SCHOOL ROAD

Over: INTERSTATE 5

02-SHA-005-R22.41, Shasta, CA

Built 1968 ADT: 21,500

1ST ST

Over: INTERSTATE 5

02-SHA-005-0.66, Shasta, CA

Built 1964 ADT: 41,000

GAS POINT RD OC

Over: INTERSTATE 5

02-SHA-005-0.91, Shasta, CA

Built 1964 ADT: 41,000

INTERSTATE 5 SB

Over: S5-MAIN ST OFF-RAMP

02-SHA-005-1.91, Shasta, CA

Built 1964 ADT: 2,000

INTERSTATE 5 NB

Over: S5-MAIN ST OFF-RAMP

02-SHA-005-1.91, Shasta, CA

Built 1964 ADT: 2,000

UP RR & AMTRAK

Over: I-5 & ANTLERS ROAD

02-SHA-005-R40.60, Shasta, CA

Built 1972 ADT: 17,200

MCR RY

Over: STATE ROUTE 89

02-SHA-089-29.34, Shasta, CA

Built 1955 ADT: 1,700

UP RR & AMTRAK

Over: STATE ROUTE 151

02-SHA-151-5.51, Shasta, CA

Built 1938 ADT: 1,800

N5-E44 CONNECTOR

Over: HILLTOP DR

02-SHA-005-R15.31-RDG, Shasta, CA

Built 1968 ADT: 5,000

HILLTOP DR

Over: INTERSTATE 5

02-SHA-005-R16.15-RDG, Shasta, CA

Built 1965 ADT: 53,000

HILLTOP DR

Over: STATE ROUTE 44

02-SHA-044-R0.13-RDG, Shasta, CA

Built 1968 ADT: 48,500

SWEETBRIER AVE

Over: INTERSTATE 5

02-SHA-005-61.75, Shasta, CA

Built 1962 ADT: 17,100

CHURN CREEK ROAD

Over: INTERSTATE 5

02-SHA-005-R12.15-RDG, Shasta, CA

Built 1965 ADT: 51,000

LOMA VISTA DR

Over: INTERSTATE 5

02-SHA-005-R12.92-RDG, Shasta, CA

Built 1965 ADT: 53,000

HARTNELL AVE

Over: INTERSTATE 5

02-SHA-005-R13.95-RDG, Shasta, CA

Built 1965 ADT: 53,000

N5-W44 CONNECTOR

Over: STATE ROUTE 44

02-SHA-005-R15.43-RDG, Shasta, CA

Built 1965 ADT: 48,500

INTERSTATE 5 SB

Over: STATE ROUTE 44

02-SHA-005-R15.43-RDG, Shasta, CA

Built 1965 ADT: 48,500

INTERSTATE 5 NB

Over: STATE ROUTE 44

02-SHA-005-R15.43-RDG, Shasta, CA

Built 1965 ADT: 48,500

INTERSTATE 5 SB

Over: N5-W44 CONNECTOR RAMP

02-SHA-005-R15.56-RDG, Shasta, CA

Built 1965 ADT: 23,000

INTERSTATE 5 NB

Over: N5-W44 CONNECTOR RAMP

02-SHA-005-R15.59-RDG, Shasta, CA

Built 1965 ADT: 23,000

INTERSTATE 5 SB

Over: STATE ROUTE 299

02-SHA-005-R17.30-RDG, Shasta, CA

Built 1965 ADT: 18,509

INTERSTATE 5 NB

Over: STATE ROUTE 299

02-SHA-005-R17.30-RDG, Shasta, CA

Built 1965 ADT: 18,509

INTERSTATE 5 SB

Over: TURNTABLE BAY ROAD

02-SHA-005-R29.29L, Shasta, CA

Built 1968 ADT: 400

TURNTABLE BAY ROAD

Over: INTERSTATE 5 NB

02-SHA-005-R29.32R, Shasta, CA

Built 1968 ADT: 18,300

KNIGHTON ROAD

Over: INTERSTATE 5

02-SHA-005-R9.77, Shasta, CA

Built 1965 ADT: 51,069

STATE ROUTE 44 WB

Over: CONTINENTAL STREET

02-SHA-044-L0.40L-RDG, Shasta, CA

Built 1965 ADT: 4,000

STATE ROUTE 299 EB

Over: CONTINENTAL STREET

02-SHA-044-L0.44R-RDG, Shasta, CA

Built 1965 ADT: 4,000

N273-N5 CONNECTOR

Over: INTERSTATE 5

02-SHA-273-20.00-RDG, Shasta, CA

Built 1965 ADT: 52,000

SMITH ROAD

Over: INTERSTATE 5

02-SHA-005-R10.85, Shasta, CA

Built 1965 ADT: 51,000

INTERSTATE 5 SB

Over: STATE ROUTE 273

02-SHA-005-R3.82, Shasta, CA

Built 1966 ADT: 9,500

INTERSTATE 5 NB

Over: STATE ROUTE 273

02-SHA-005-R3.82, Shasta, CA

Built 1966 ADT: 9,500

INTERSTATE 5 SB

Over: TWIN VIEW BLVD

02-SHA-005-R18.07-RDG, Shasta, CA

Built 1965 ADT: 2,000

INTERSTATE 5 NB

Over: TWIN VIEW BLVD

02-SHA-005-R18.07-RDG, Shasta, CA

Built 1965 ADT: 2,000

RIVERSIDE AVE

Over: INTERSTATE 5

02-SHA-005-R6.74, Shasta, CA

Built 1966 ADT: 39,000

BRIDGE BAY ROAD

Over: INTERSTATE 5

02-SHA-005-R27.63, Shasta, CA

Built 1968 ADT: 19,500

OLD OREGON TRAIL

Over: INTERSTATE 5

02-SHA-005-R24.08, Shasta, CA

Built 1968 ADT: 21,500

OASIS ROAD

Over: INTERSTATE 5

02-SHA-005-R19.40-RDG, Shasta, CA

Built 1968 ADT: 34,000

STATE ROUTE 151

Over: INTERSTATE 5

02-SHA-151-R6.90, Shasta, CA

Built 1968 ADT: 29,500

GREGORY CREEK ROAD

Over: INTERSTATE 5

02-SHA-005-R39.05, Shasta, CA

Built 1966 ADT: 17,600

GILMAN ROAD

Over: INTERSTATE 5

02-SHA-005-R36.83, Shasta, CA

Built 1966 ADT: 17,600

PINE GROVE AVE

Over: INTERSTATE 5

02-SHA-005-R21.00, Shasta, CA

Built 1968 ADT: 29,500

WONDERLAND-FAWNDAL

Over: INTERSTATE 5

02-SHA-005-R26.04, Shasta, CA

Built 1968 ADT: 19,500

INTERSTATE 5 SB

Over: LAKEHEAD ROAD

02-SHA-005-R42.32, Shasta, CA

Built 1972 ADT: 250

POLLARD FLAT ROAD

Over: INTERSTATE 5

02-SHA-005-R50.81, Shasta, CA

Built 1991 ADT: 17,100

STATE ROUTE 299

Over: OLD OREGON TRAIL

02-SHA-299-27.22, Shasta, CA

Built 1974 ADT: 10,600

STATE ROUTE 299

Over: OLD OREGON TRAIL

02-SHA-299-27.22, Shasta, CA

Built 1974 ADT: 10,600

GIBSON ROAD

Over: INTERSTATE 5

02-SHA-005-53.30, Shasta, CA

Built 1989 ADT: 17,100

SLATE CREEK ROAD

Over: INTERSTATE 5

02-SHA-005-R49.15, Shasta, CA

Built 1991 ADT: 17,100

AIRPORT ROAD

Over: STATE ROUTE 44

02-SHA-044-R3.63, Shasta, CA

Built 1972 ADT: 15,550

Read our methodology — how this data is sourced, computed, and verified.

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Data sourced from official U.S. government datasets. See our methodology for details. Retrieved and formatted by PlainBridges Editorial

Reviewed byPlainbridges Editorial, Plain Bridges Editorial Team · June 6, 2026