Ada County, ID

81 public highway bridges

Ada County Bridge Snapshot

Ada County, Idaho contains 81 public highway bridges in the FHWA National Bridge Inventory. Roughly 39.5% are rated “Good,” 45.7% “Fair,” 0% “Poor,” and 0% 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.

81
Total Bridges
39.5%
Good
0%
Poor
0%
Structurally Deficient

Condition Distribution

Good
39.5% (32)
Fair
45.7% (37)
Poor
0% (0)
SD
0% (0)

All Bridges (81)

SH 21

Good

Over: BOISE RIVER

NEAR DIVERSION DAM, Ada, ID

Built 1996 Load: 29.0 t ADT: 6,400

SMA 7343;CHERRY LN

Good

Over: TEN MILE CREEK

0.5 N. 3.5 W. MERIDIAN, Ada, ID

Built 1961 Load: 29.0 t ADT: 5,900

SMA 9793; MAIN ST

Good

Over: BOISE VRT CENTER

MAIN ST EAST OF 8TH ST, Ada, ID

Built 2016 Load: 30.1 t ADT: 6,000

STP 7073;COLE RD

Good

Over: RIDENBAUGH CANAL;COLE GS

0.7 W. BOISE WCL;COLE RD, Ada, ID

Built 1968 Load: 30.8 t ADT: 14,000

STC 3784;E KUNA RD

Good

Over: NEW YORK CANAL

3.4 E. KUNA, Ada, ID

Built 1977 Load: 31.8 t ADT: 2,600

S3760;FLTG FEATHER

Good

Over: MIDDLETON CANAL

1.0 N. 0.2 E. STAR, Ada, ID

Built 1988 Load: 32.7 t ADT: 4,400

SMA9243;VICTORY RD

Good

Over: CALKINS LATERAL

2.5 S 1.9 W MERIDIAN, Ada, ID

Built 2016 Load: 32.7 t ADT: 3,800

STC9573:E MALLARD

Good

Over: LOGGERS CREEK

IN BOISE; E.MALLARD DRIVE, Ada, ID

Built 2023 Load: 32.7 t ADT: 2,600

ESTHER SIMPLOT PK

Good

Over: ESTHERS POND

IN ESTHER SIMPLOT PARK, Ada, ID

Built 2016 Load: 34.3 t ADT: 80

SH 55

Good

Over: BOISE RIVER;N.CHANNEL

0.7 S. EAGLE, Ada, ID

Built 1978 Load: 34.5 t ADT: 40,500

I 84 WBL

Good

Over: NEW YORK CANAL

IN BOISE;NEAR ORCHARD ST., Ada, ID

Built 1968 Load: 36.3 t ADT: 44,500

SH 16

Good

Over: BOISE RIVER

1.3 E. STAR SCL, Ada, ID

Built 2014 Load: 36.9 t ADT: 19,500

I 84 EBL

Good

Over: NEW YORK CANAL

IN BOISE;NEAR ORCHARD ST., Ada, ID

Built 1968 Load: 39.0 t ADT: 44,500

STC 3856; FRANKLIN

Good

Over: FIVE MILE CREEK

IN MERIDIAN, Ada, ID

Built 2004 Load: 39.9 t ADT: 23,500

HANLEY PLACE

Good

Over: WILLOW CREEK

6.95 S. EMMETT, Ada, ID

Built 2023 Load: 41.1 t ADT: 40

SPRING CREEK WAY

Good

Over: DRY CREEK

DRY CREEK RANCH, Ada, ID

Built 2021 Load: 43.7 t ADT: 130

STP7220;STATE ST

Good

Over: FARMERS UNION CANAL

IN BOISE @ COLLISTER, Ada, ID

Built 2019 Load: 44.1 t ADT: 34,000

BETHEL STREET

Good

Over: RIDENBAUGH CANAL

IN BOISE, Ada, ID

Built 1998 Load: 45.4 t ADT: 1,000

GLASSFORD WAY

Good

Over: FIVE MILE CREEK

NW MERIDIAN CL, Ada, ID

Built 2020 Load: 50.2 t ADT: 25

ECHANOVE RD

Good

Over: CURRANT CREEK

IN BOISE;HIDDEN SPRINGS, Ada, ID

Built 2002 Load: 52.6 t ADT: 99

MYERS STREET

Good

Over: LOGGERS CREEK

IN BOISE;MYERS ST., Ada, ID

Built 1972 Load: 54.4 t ADT: 200

SMA9773;LINDER RD

Good

Over: RIDENBAUGH CANAL

2.2 S. 1.1 W. MERIDIAN, Ada, ID

Built 1992 Load: 55.3 t ADT: 4,600

STP7243;E PARK CTR

Good

Over: LOGGERS CREEK

EAST BOISE, Ada, ID

Built 2009 Load: 56.4 t ADT: 9,600

S. BAILEY WAY

Good

Over: TEN MILE CREEK

2.0 S. 0.7 E. MERIDIAN, Ada, ID

Built 2007 Load: 58.1 t ADT: 200

BARBER VALLEY DR

Good

Over: WALLING CREEK

SE BOISE, Ada, ID

Built 2018 Load: 58.6 t ADT: 5,500

BROOKSIDE LANE

Good

Over: DRY CREEK

2.0 N. 1.8 E. EAGLE, Ada, ID

Built 1994 Load: 59.9 t ADT: 250

N. GRAND LAKE WAY

Good

Over: FIVE MILE CREEK

3.45 N. MERIDIAN, Ada, ID

Built 2022 Load: 64.2 t ADT: 50

STC 7073;S.COLE RD

Good

Over: NEW YORK CANAL

ON S.COLE RD;0.3N.VALLEJO, Ada, ID

Built 1989 Load: 76.2 t ADT: 2,200

N. ECHOHAWK WAY

Good

Over: FARMERS UNION CANAL

IN EAGLE, Ada, ID

Built 1999 Load: 78.0 t ADT: 200

N FAWNRIDGE WAY

Good

Over: FIVE MILE CREEK

2.3 N 3.5 W. MERIDIAN, Ada, ID

Built 2022 Load: 97.2 t ADT: 100

E. BRANCHWOOD

Good

Over: SQUAW CREEK

IN BOISE, Ada, ID

Built 2001 Load: 99.9 t ADT: 400

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