Boise County, ID

41 public highway bridges

Boise County Bridge Snapshot

Boise County, Idaho contains 41 public highway bridges in the FHWA National Bridge Inventory. Roughly 63.4% are rated “Good,” 29.3% “Fair,” 7.3% “Poor,” and 7.3% 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.

41
Total Bridges
63.4%
Good
7.3%
Poor
7.3%
Structurally Deficient

Condition Distribution

Good
63.4% (26)
Fair
29.3% (12)
Poor
7.3% (3)
SD
7.3% (3)

All Bridges (41)

PINE CREEK ROAD

Fair

Over: GRIMES CREEK

9.5 MI S.W. OF ID CITY, Boise, ID

Built 1947 ADT: 25

LIGHTENING CR RD

Fair

Over: M. FK. PAYETTE

8 MI NORTH OF CROUCH ID, Boise, ID

Built 1964 Load: 17.5 t ADT: 50

OKEEFE CREEK ROAD

Fair

Over: CLEAR CREEK

6.5 MI NNE OF LOWMAN, ID, Boise, ID

Built 1966 Load: 18.8 t ADT: 10

CAMPGRD. ACCESS

Fair

Over: SOUTH FORK PAYETTE RIVER

KIRKHAM HOT SPRINGS CG., Boise, ID

Built 1966 Load: 19.1 t ADT: 60

ARCHIE CK. ROAD

Fair

Over: SOUTH FORK PAYETTE RIVER

5 MI EAST OF LOWMAN IDAHO, Boise, ID

Built 1962 Load: 20.1 t ADT: 40

WILLIS FLAT ROAD

Fair

Over: SO.FK.PAYETTE RIVER

14 MI EAST OF LOWMAN, ID, Boise, ID

Built 1959 Load: 22.0 t ADT: 35

SMA 3824;BNKS LWMN

Fair

Over: DEADWOOD RIVER

22.1 E. CROUCH, Boise, ID

Built 1985 Load: 22.7 t ADT: 660

FIVE MILE ROAD

Fair

Over: FIVE MILE CREEK

1 MI N.E. OF HELENDE C.G., Boise, ID

Built 1981 Load: 24.6 t ADT: 10

SMITH CREEK ROAD

Fair

Over: M.FK.PAYETTE R;R.SMITH C

3.2 N. 0.2 E. CROUCH, Boise, ID

Built 1973 Load: 26.1 t ADT: 25

STC 3883;ROBIE CRK

Fair

Over: MORES CREEK

13.6 S. 8.1 W. IDAHO CITY, Boise, ID

Built 1997 Load: 27.2 t ADT: 300

N.FK. BOISE R. RD.

Fair

Over: NORTH FORK BOISE RIVER

(DEER PARK BRIDGE), Boise, ID

Built 1949 Load: 32.4 t ADT: 59

SPUR 348J

Fair

Over: PIKES FORK CREEK

NEAR NFSR 312/348J JUNCT, Boise, ID

Built 1985 Load: 32.7 t ADT: 10

NO DATA ENTERED

Good

Over: ROARING RIVER

NO DATA ENTERED, Boise, ID

Built 2007 ADT: 50

NO DATA ENTERED

Good

Over: SCRIVER CREEK

NO DATA ENTERED, Boise, ID

Built 2022 ADT: 50

TRAPPER CK. ROAD

Good

Over: NORTH FORK BOISE RIVER

2.5 MI SW OF DEER PARK, Boise, ID

Built 1977 Load: 12.3 t ADT: 10

EDNA CK.-L.OWL RD.

Good

Over: CROOKED RIVER

8 MI EAST OF PILOT PEAK, Boise, ID

Built 1976 Load: 12.6 t ADT: 150

PRIVATE ROAD

Good

Over: MORES CREEK

6.2 S. 5.2 W. IDAHO CITY, Boise, ID

Built 1985 Load: 14.5 t ADT: 15

N.FK. BOISE R. RD.

Good

Over: MORES CREEK

2 MI EAST OF IDAHO CITY, Boise, ID

Built 1955 Load: 16.2 t ADT: 79

LONG CREEK ROAD

Good

Over: CLEAR CREEK

4.5 MI NE OF LOWMAN ID, Boise, ID

Built 1980 Load: 18.8 t ADT: 20

N.FK. BOISE R. RD.

Good

Over: CROOKED RIVER

3 MI N OF BARBER FLAT, Boise, ID

Built 1957 Load: 19.8 t ADT: 40

HUNTER CK-CRKD. R.

Good

Over: BEAR CREEK

3.8 MI N.W. OF DEER PARK, Boise, ID

Built 1963 Load: 19.8 t ADT: 12

HUNTER CK-CRKD. R.

Good

Over: CROOKED RIVER

6.8 MI NNW OF DEER PARK, Boise, ID

Built 1963 Load: 24.3 t ADT: 12

WAPITI ROAD

Good

Over: SOUTH FORK PAYETTE RIVER

WAPITI CR SUMMER HOME, Boise, ID

Built 1976 Load: 25.3 t ADT: 25

ROUGH CREEK ROAD

Good

Over: MORES CREEK

8.5 MI NE IDAHO CITY, Boise, ID

Built 1979 Load: 27.2 t ADT: 25

W. WILLOW-BIG OWL

Good

Over: CROOKED RIVER

2 MI E. OF EDNA CREEK CG, Boise, ID

Built 1971 Load: 27.5 t ADT: 15

OKEEFE CREEK ROAD

Good

Over: CLEAR CREEK

9 MI NNE OF LOWMAN, ID, Boise, ID

Built 1966 Load: 27.5 t ADT: 10

WILLOW CK.-CRKD.R.

Good

Over: CROOKED RIVER

7 MI NW DEER PARK, Boise, ID

Built 1970 Load: 28.5 t ADT: 5

LT. ANDERSON CK RD

Good

Over: ANDERSON CREEK

2 MI NE OF GARDEN VALLEY, Boise, ID

Built 1983 Load: 28.5 t ADT: 12

PARK CK. C.G. RD.

Good

Over: CLEAR CREEK

3 MI N.E. OF LOWMAN, ID, Boise, ID

Built 1957 Load: 33.0 t ADT: 25

SUMMIT FLAT ROAD

Good

Over: GRIMES CREEK

5 MI SW OF PINE FLATS CG, Boise, ID

Built 1982 Load: 33.7 t ADT: 12

NFSR 347

Good

Over: GRAYBACK GULCH

2.5 MI SW OF IDAHO CITY, Boise, ID

Built 2018 Load: 35.0 t ADT: 50

PIONEER ROAD

Good

Over: SHAFER CREEK

1.0S 0.1W HORSESHOE BEND, Boise, ID

Built 1988 Load: 36.3 t ADT: 280

GRAND JEAN ROAD

Good

Over: CANYON CREEK

.25 MI N WAPITI CK TRACT, Boise, ID

Built 1972 Load: 39.2 t ADT: 80

SH 21

Good

Over: MORES CR.;WILDCAT GULCH

8.5 S. IDAHO CITY, Boise, ID

Built 1990 Load: 39.9 t ADT: 2,000

DEADWD.-SCT.MT.RD.

Good

Over: EAST BIG PINE CREEK

4 MI NE DANSKIN, Boise, ID

Built 2007 Load: 41.1 t ADT: 15

EDNA CK.-L.OWL RD.

Good

Over: PIKES FORK CREEK

3 MI ENE OF EDNA CR CG, Boise, ID

Built 2005 Load: 41.5 t ADT: 50

HUNTER CK-CRKD. R.

Good

Over: BEAR RIVER

3 MI N.W. OF DEER PARK, Boise, ID

Built 1965 Load: 41.8 t ADT: 12

SH 21

Good

Over: MORES CR;MCKINLEY GULCH

5.9 S. IDAHO CITY, Boise, ID

Built 1990 Load: 43.5 t ADT: 2,000

AVELENE CK. ROAD

Poor

Over: GRIMES CREEK

9 MI SW OF IDAHO CITY, Boise, ID

Built 1954 Load: 9.1 t ADT: 20

COTTONWD-BANNOCK

Poor

Over: MORES CREEK

1 MI ESE OF IDAHO CITY, Boise, ID

Built 1962 Load: 20.7 t ADT: 30

BOULDER CREEK ROAD

Poor

Over: MORES CREEK

5 MI NE IDAHO CITY, Boise, ID

Built 1982 Load: 24.0 t ADT: 50

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