Canyon County, ID

77 public highway bridges

Canyon County Bridge Snapshot

Canyon County, Idaho contains 77 public highway bridges in the FHWA National Bridge Inventory. Roughly 22.1% are rated “Good,” 66.2% “Fair,” 1.3% “Poor,” and 1.3% 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 ID 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.

77
Total Bridges
22.1%
Good
1.3%
Poor
1.3%
Structurally Deficient

Condition Distribution

Good
22.1% (17)
Fair
66.2% (51)
Poor
1.3% (1)
SD
1.3% (1)

All Bridges (77)

SH 44

Unknown

Over: I 84 EB-WB;MIDDLETON IC

1.9 W. CALDWELL, Canyon, ID

Built 1964 ADT: 43,000

SH 55

Unknown

Over: I 84;KARCHER-MIDLAND IC

IN NAMPA, Canyon, ID

Built 2006 ADT: 86,500

I 84 WBL

Unknown

Over: PURPLE SAGE GS

3.3 W. CALDWELL, Canyon, ID

Built 1962 ADT: 1,300

I 84 WBL & EBL

Unknown

Over: I 84B ;GARRITY BLVD IC

AT NAMPA ECL, Canyon, ID

Built 2011 ADT: 29,000

US 95

Unknown

Over: US20;UPRR;US 20-95 IC

1.5 E. PARMA, Canyon, ID

Built 2017 ADT: 7,000

SMA8353;16TH AVE

Unknown

Over: UPRR;1ST ST N

IN NAMPA;16TH AVE, Canyon, ID

Built 1969 ADT: 100

STC 8433; 11TH AVE

Unknown

Over: I 84;11TH AVE N. GS

IN NAMPA;11th AVE N., Canyon, ID

Built 2010 ADT: 105,500

GALLOWAY ROAD

Unknown

Over: I 84;GALLOWAY ROAD GS

4.3 W. CALDWELL, Canyon, ID

Built 1962 ADT: 30,500

TUCKER ROAD

Fair

Over: DIXIE SLOUGH

1.2 N. 3.4 E. WILDER, Canyon, ID

Built 1990 Load: 15.4 t ADT: 20

STP 8213;MIDDLETON

Fair

Over: CALDWELL HIGHLINE CANAL

4.0 S. 0.3 E. MIDDLETON, Canyon, ID

Built 1950 Load: 16.3 t ADT: 9,400

PARMA ROAD

Fair

Over: D LINE CANAL

2.4 N. 0.4 E. PARMA, Canyon, ID

Built 1971 Load: 16.3 t ADT: 90

WALKER LAKE ROAD

Fair

Over: HIGH LINE CANAL

1.3 N. 3.5 E. MARSING, Canyon, ID

Built 1967 Load: 16.3 t ADT: 90

BURDEN ROAD

Fair

Over: FARMERS COOP SEBREE CNL

0.8 N. 1.4 E. PARMA, Canyon, ID

Built 1977 Load: 16.3 t ADT: 360

NHS 3761;NORTHSIDE

Fair

Over: FIFTEEN MILE CREEK

3.2 S. 2.3 E. MIDDLETON, Canyon, ID

Built 1970 Load: 16.3 t ADT: 4,200

STC 8433;11TH AVE

Fair

Over: PHYLLIS CNL;11TH AVE EXT

IN NAMPA, Canyon, ID

Built 1994 Load: 16.3 t ADT: 5,000

STC7808;MIDDLETON

Fair

Over: WILLOW CREEK

1.3 N. 0.3 E. MIDDLETON, Canyon, ID

Built 1978 Load: 16.3 t ADT: 910

STC 7863;S.5TH AVE

Fair

Over: INDIAN CREEK

IN CALDWELL;S. 5TH AVE., Canyon, ID

Built 1935 Load: 16.3 t ADT: 2,900

BOISE STREET

Fair

Over: MILL SLOUGH

AT MIDDLETON SCL, Canyon, ID

Built 1981 Load: 17.2 t ADT: 200

STC3790;ALLENDALE

Fair

Over: LOW LINE CANAL

3.7 S. 2.O E. WILDER, Canyon, ID

Built 1939 Load: 18.1 t ADT: 240

STC 8423;LK LOWELL

Fair

Over: DEER FLAT NAMPA CANAL

1.3 S 2.8 W NAMPA, Canyon, ID

Built 1992 Load: 20.9 t ADT: 6,200

SMA 3723;ROBINSON

Fair

Over: MORA CANAL

8.2 S. 3.4 E. NAMPA, Canyon, ID

Built 1984 Load: 20.9 t ADT: 1,200

S3792;UPPR PLEASNT

Fair

Over: DEER FLAT LOW LINE CANAL

2.0 S. 4.8 E. WILDER, Canyon, ID

Built 1950 Load: 20.9 t ADT: 280

STC3762;GREENHURST

Fair

Over: NEW YORK CANAL

3.0S 4.0E NAMPA CITY CTR, Canyon, ID

Built 1972 Load: 20.9 t ADT: 2,800

STC3755;SOUTHSIDE

Fair

Over: MORA CANAL

8.9 S. 1.4 E. NAMPA, Canyon, ID

Built 1975 Load: 20.9 t ADT: 1,400

SMA8513;ID CNTR RD

Fair

Over: PHYLLIS CANAL

2.5 N. 2.4 E. NAMPA, Canyon, ID

Built 1987 Load: 20.9 t ADT: 25,000

PEEBLES LANE

Fair

Over: RIVERSIDE CANAL

3.0 S. 2.4 W. PARMA, Canyon, ID

Built 1977 Load: 20.9 t ADT: 250

DIP LANE

Fair

Over: FARMERS COOP CANAL

1.8 S. 5.2 E. PARMA, Canyon, ID

Built 1979 Load: 20.9 t ADT: 200

STC3738;SHELTON RD

Fair

Over: FARMERS COOP SEBREE CNL

0.6 N. 1.8 E. PARMA, Canyon, ID

Built 1975 Load: 20.9 t ADT: 580

HOLLOW ROAD

Fair

Over: 'C' LINE WEST CANAL

9.1 N. 0.4 E. CALDWELL, Canyon, ID

Built 1985 Load: 20.9 t ADT: 70

SMA8443;VICTORY RD

Fair

Over: RIDENBAUGH CANAL

4.0 E NAMPA, Canyon, ID

Built 1980 Load: 20.9 t ADT: 3,900

S. 9TH AVENUE

Fair

Over: INDIAN CREEK

IN CALDWELL;S.9TH AVE, Canyon, ID

Built 1968 Load: 20.9 t ADT: 750

STEPHEN LANE

Fair

Over: RIVERSIDE CANAL

3.2 S. 0.7 W. PARMA, Canyon, ID

Built 1983 Load: 21.8 t ADT: 200

GOTSCH ROAD

Fair

Over: 'D' LINE CANAL

0.7 N. 3.7 E. PARMA, Canyon, ID

Built 1974 Load: 24.3 t ADT: 100

STP8393;FRANKLIN B

Fair

Over: PHYLLIS CANAL

IN NAMPA;FRANKLIN BLVD., Canyon, ID

Built 1963 Load: 24.5 t ADT: 23,000

STP8393;FRANKLIN B

Fair

Over: PHYLLIS CANAL

IN NAMPA;FRANKLIN BLVD., Canyon, ID

Built 1963 Load: 25.4 t ADT: 26,500

US 95

Fair

Over: GOLDEN GATE CANAL

WILDER SCL, Canyon, ID

Built 1956 Load: 26.3 t ADT: 7,100

SH 45

Fair

Over: MORA CANAL

7.5 S. NAMPA, Canyon, ID

Built 1956 Load: 27.2 t ADT: 3,400

I 84 EB OFF RAMP

Fair

Over: BOISE RIVER;RAMP AB BR

IN CALDWELL, Canyon, ID

Built 1980 Load: 27.2 t ADT: 5,000

STC 3730;RIVERSIDE

Fair

Over: DEER FLAT HIGH LINE CNL

1.8 N. 3.3 E. MARSING, Canyon, ID

Built 1986 Load: 28.1 t ADT: 970

E. SIMPLOT BLVD.

Fair

Over: INDIAN CREEK

IN CALDWELL, Canyon, ID

Built 1965 Load: 28.1 t ADT: 280

LINDEN ROAD

Fair

Over: MASON CREEK

1.0 S. 4.5 E. CALDWELL, Canyon, ID

Built 1974 Load: 28.1 t ADT: 6,700

I 84

Fair

Over: FARMERS SEBREE CANAL

IN CALDWELL, Canyon, ID

Built 1980 Load: 29.9 t ADT: 51,000

US 95

Fair

Over: RIVERSIDE CANAL

4 N. WILDER, Canyon, ID

Built 1964 Load: 29.9 t ADT: 3,900

OLD FORT BOISE RD.

Fair

Over: 'D' LINE CANAL

2.4 N. 0.3 E. PARMA, Canyon, ID

Built 1984 Load: 29.9 t ADT: 90

LYNWOOD ROAD

Fair

Over: MORA CANAL

8.8 S. 1.6 W. NAMPA, Canyon, ID

Built 1998 Load: 30.8 t ADT: 90

HOLLOW ROAD

Fair

Over: 'C' LINE EAST CANAL

9.1 N. 1.0 E. CALDWELL, Canyon, ID

Built 1977 Load: 32.4 t ADT: 50

SMA7808;MIDDLETON

Fair

Over: MILL SLOUGH

MIDDLETON NE CITY LIMITS, Canyon, ID

Built 1999 Load: 32.7 t ADT: 3,400

STC 3790;ALLENDALE

Fair

Over: GOLDEN GATE CANAL

0.6 S. 2.0 E. WILDER, Canyon, ID

Built 1992 Load: 32.7 t ADT: 240

TUCKER ROAD

Fair

Over: LOW LINE CANAL

1.0 S. 4.0 E. WILDER, Canyon, ID

Built 1997 Load: 32.7 t ADT: 70

BROADMORE WAY

Fair

Over: INDIAN CREEK

IN NAMPA, Canyon, ID

Built 1948 Load: 33.6 t ADT: 20

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

Related

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