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)

US 30

Unknown

Over: I 184B WB-EB;FAIRVIEW RP

IN BOISE;FAIRVIEW RAMP, Ada, ID

Built 1968 ADT: 60,500

SH 69;MERIDIAN RD

Unknown

Over: I 84;SH 69 MERIDIAN IC

MERIDIAN SCL, Ada, ID

Built 2015 ADT: 137,000

I 84 EBL

Unknown

Over: KUNA RD; BLACKS CREEK RD

9.2 E. BOISE ECL, Ada, ID

Built 2020 ADT: 1,000

I 184 WBL CONNECTR

Unknown

Over: US 20-26;BOISE RV SLOUGH

IN BOISE;CHINDEN BLVD IC, Ada, ID

Built 1991 ADT: 5,500

US 20 26 RAMP

Unknown

Over: BOISE RVR SLOUGH;RAMP

BOISE;FAIRVIEW/CHINDEN IC, Ada, ID

Built 1991 ADT: 11,000

STP 9183;TEN MILE

Unknown

Over: TASA DRIVE

1.4 S 2.1 W. MERIDIAN, Ada, ID

Built 2011 ADT: 80

SMA 7113;CURTIS RD

Unknown

Over: I 184B;CURTIS RD IC

IN BOISE;CURTIS ROAD, Ada, ID

Built 1968 ADT: 78,000

STP8973;ORCHARD ST

Unknown

Over: I 84 EB-WB;ORCHARD ST IC

IN BOISE; ORCHARD ST, Ada, ID

Built 2010 ADT: 92,500

STP 7343;MAIN ST.

Unknown

Over: US 20-26 CHINDEN BLVD

IN BOISE; GARDEN CITY CL, Ada, ID

Built 1991 ADT: 22,500

SMA9783;LOCUST GRV

Unknown

Over: I 84;LOCUST GROVE GS

1.8 SE MERIDIAN, Ada, ID

Built 2008 ADT: 137,000

W.AIRPORT WAY-DEPT

Unknown

Over: W.AIRPORT WAY-ARRIVAL

AT BOISE AIRPORT, Ada, ID

Built 2004 ADT: 4,000

SH 16

Unknown

Over: W.JOPLIN CT;EUREKA CANAL

0.8 S 1.25 E STAR SCL, Ada, ID

Built 2014 ADT: 300

STC3024;POLLARD LN

Fair

Over: MIDDLETON CANAL

0.6 N. 1.3 E. STAR, Ada, ID

Built 1967 Load: 3.6 t ADT: 1,300

SMA3343;COLUMBIA

Fair

Over: RAWSON CANAL

2.8 N 3.3 E KUNA, Ada, ID

Built 1976 Load: 16.3 t ADT: 3,400

SMA 7563;OVERLAND

Fair

Over: TEN MILE CREEK

1.0 S. 0.1 E. MERIDIAN, Ada, ID

Built 1986 Load: 20.9 t ADT: 24,000

ASPEN COVE

Fair

Over: RIDENBAUGH CANAL

1.9 S. 1.2 W. MERIDIAN, Ada, ID

Built 1974 Load: 20.9 t ADT: 390

STC 9203;BARRISTER

Fair

Over: RIDENBAUGH CANAL

IN BOISE;BARRISTER DR., Ada, ID

Built 1978 Load: 20.9 t ADT: 6,200

WALTMAN LANE

Fair

Over: TEN MILE CREEK

0.9 S. 0.4 W. MERIDIAN, Ada, ID

Built 1965 Load: 20.9 t ADT: 80

S3760;FLTG FEATHER

Fair

Over: MIDDLETON CANAL

1.0 N. STAR, Ada, ID

Built 1994 Load: 20.9 t ADT: 4,800

STC 7483;MCDERMOTT

Fair

Over: RIDENBAUGH CANAL

1.8 S. 4.1 W. MERIDIAN, Ada, ID

Built 1969 Load: 20.9 t ADT: 590

S3784;LOCUST GROVE

Fair

Over: RAWSON CANAL

5.3 S. 0.8 E. MERIDIAN, Ada, ID

Built 1973 Load: 25.2 t ADT: 1,500

NHS 7433;VISTA AVE

Fair

Over: NEW YORK CANAL

IN BOISE;VISTA AVE., Ada, ID

Built 1973 Load: 26.3 t ADT: 27,000

SMA3778;DRY CRK RD

Fair

Over: DRY CREEK

HIDDEN SPRINGS, Ada, ID

Built 2006 Load: 26.3 t ADT: 1,600

STC3761;PLUMMER RD

Fair

Over: MIDDLETON CANAL

0.3 N. 1.0 E. STAR, Ada, ID

Built 1971 Load: 28.1 t ADT: 3,200

SMA 9833;MILWAUKEE

Fair

Over: RIDENBAUGH CANAL

IN BOISE;MILWAUKEE ST, Ada, ID

Built 1979 Load: 28.1 t ADT: 21,000

SMA 7363;EMERALD

Fair

Over: RIDENBAUGH CANAL

IN BOISE;EMERALD ST, Ada, ID

Built 1979 Load: 28.1 t ADT: 16,500

I 84 WBL

Fair

Over: INDIAN CREEK

15.9 E. BOISE ECL, Ada, ID

Built 1960 Load: 29.0 t ADT: 14,750

SMA7013;CLOVERDALE

Fair

Over: RIDENBAUGH CANAL

2.1 S. 2.8 E. MERIDIAN, Ada, ID

Built 1969 Load: 29.0 t ADT: 13,000

STC 3770;STAR RD

Fair

Over: BOISE RIVER(STAR BRIDGE)

0.8 S. STAR, Ada, ID

Built 1982 Load: 30.8 t ADT: 11,000

SMA 7030;STATE ST

Fair

Over: DRY CREEK

AT EAGLE WCL, Ada, ID

Built 1959 Load: 31.8 t ADT: 4,700

STC 3770;STAR RD

Fair

Over: PHYLLIS CANAL

1.8 S. STAR, Ada, ID

Built 1967 Load: 31.8 t ADT: 11,000

COLUMBIA ROAD

Fair

Over: MASON CREEK FEEDER CANAL

2.8 N. 0.8 E. KUNA, Ada, ID

Built 1989 Load: 33.6 t ADT: 5,100

SH 69

Fair

Over: RAWSON CANAL

4.0 S. MERIDIAN, Ada, ID

Built 1990 Load: 35.4 t ADT: 32,000

SMA 7113; CURTIS

Fair

Over: SETTLERS CANAL

IN BOISE, Ada, ID

Built 2000 Load: 35.4 t ADT: 28,000

STP3728;LAKE HAZEL

Fair

Over: RIDENBAUGH HIGH LINE CNL

3.7 N. 1.6 W. KUNA, Ada, ID

Built 1992 Load: 37.2 t ADT: 1,900

I 84

Fair

Over: TEN MILE CREEK

0.5 W. MERIDIAN, Ada, ID

Built 1965 Load: 38.1 t ADT: 125,500

STP7243;E PARK CTR

Fair

Over: BOISE RIVER

EAST BOISE, Ada, ID

Built 2009 Load: 41.7 t ADT: 9,600

STC 9623;W. WRIGHT

Fair

Over: NEW YORK CANAL

IN BOISE;W.WRIGHT ST, Ada, ID

Built 1989 Load: 42.6 t ADT: 6,200

SH 55

Fair

Over: DRY CREEK

8.1 NW BOISE WCL, Ada, ID

Built 1997 Load: 44.5 t ADT: 13,500

STC 7023;EDGEWOOD

Fair

Over: DRY CREEK CANAL

0.1N 1.2E Eagle, Ada, ID

Built 2015 Load: 46.0 t ADT: 2,400

SH 69

Fair

Over: TEN MILE CREEK

1.0 S. MERIDIAN, Ada, ID

Built 1963 Load: 46.3 t ADT: 47,000

DICKMAN ROAD

Fair

Over: WALDVOGEL CANAL

5.7 S. 4.3 W. KUNA, Ada, ID

Built 1950 Load: 48.6 t ADT: 200

ROBINSON ROAD

Fair

Over: WALDVOGEL CANAL

4.4 S. 3.7 W. KUNA, Ada, ID

Built 1997 Load: 49.0 t ADT: 200

SMA7013;CLOVERDALE

Fair

Over: RIDENBAUGH CANAL

3.0 E. MERIDIAN, Ada, ID

Built 1992 Load: 51.7 t ADT: 19,000

PHILLIPPI ST

Fair

Over: RIDENBAUGH CANAL

IN BOISE, Ada, ID

Built 1992 Load: 53.5 t ADT: 1,600

SMA 7603;BOISE AVE

Fair

Over: RIDENBAUGH CANAL

IN BOISE ON BOISE AVENUE, Ada, ID

Built 1988 Load: 54.4 t ADT: 5,800

ALPINE STEET

Fair

Over: ELEC LGHT SWITCH LATERAL

IN BOISE, Ada, ID

Built 1970 Load: 73.5 t ADT: 960

SMA 9183;TEN MILE

Fair

Over: RIDENBAUGH CANAL

0.3 S. OVERLAND-TEN MILE, Ada, ID

Built 1993 Load: 78.9 t ADT: 18,500

STP 3794;EAGLE RD

Fair

Over: FARR LATERAL CANAL

3.4 N. 3.3 E. KUNA, Ada, ID

Built 1993 Load: 99.9 t ADT: 1,900

SMA 7143;USTICK RD

Good

Over: NORTH SLOUGH

IN BOISE, Ada, ID

Built 2014 Load: 27.5 t ADT: 16,000

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

Related

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