County profile · official public datasets

Hamilton County, KS

68 public highway bridges tracked in the FHWA National Bridge Inventory: 88.2% rated Good, 11.8% Fair, 0% Poor.

68
Public bridges
88.2%
Good condition
0%
Poor condition

The verdict

According to the Federal Highway Administration's 2024 National Bridge Inventory.

Hamilton County pairs a top-5% lowest Poor-condition share among rated counties in the state with an older average build year than the state inventory.

Top 5%
lowest Poor share in state
0%
Poor-condition share
68
public highway bridges
1955
avg year built

Poor is an FHWA condition category from the lowest applicable component rating (4 or below), not a live crossing-safety or closure decision. Rankings cover counties with at least five public highway bridges.

Hamilton County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Hamilton County ranks #5 of 104 Kansas counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 0%). Hamilton County, Kansas contains 68 public highway bridges. Roughly 88.2% are rated “Good,” 11.8% “Fair,” and 0% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.

Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.

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

Total bridges

68

Public highway bridges in Hamilton County

Good condition

88.2%

60 of 68 rated 7-9

Fair condition

11.8%

8 of 68 rated 5-6

Poor condition

0%

0 of 68 rated 4 or below

In-state Poor-share rank

#5 of 104

Among Kansas counties with 5+ bridges, lower share ranks better

Condition distribution

Share of 68 NBI-tracked bridges by lowest applicable component rating.

Good
88.2% (60)
Fair
11.8% (8)
Poor
0% (0)

92.6% of Hamilton County's bridges have passed the 50-year mark

63 of the 68 bridges with a recorded construction year were built in 1974 or earlier. Age alone is not a defect: a well-maintained older bridge can rate Good, and 88.2% of this county's inventory does. Even so, this older cohort is the population from which future Poor ratings are drawn, which is why the age profile below matters alongside the condition split above.

Cutoff derives from the 2024 release year minus a 50-year design life. Source: FHWA National Bridge Inventory, 2024 release.

When Hamilton County's bridges were built

68 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1930s, when 27 of the county's bridges still in the inventory were built, which is 39.7% of those with a recorded year. That cohort is now 85 to 94 years old in the 2024 inventory. Its average build year is 1955, 17 years older than the Kansas average of 1972.

Source FHWA National Bridge Inventory (year built) As of 2024 NBI release

How Hamilton County compares with Kansas's closest counties by inventory size

The 5 Kansas counties nearest Hamilton County in number of bridges, with their condition splits. Its 0% Poor share is the 2nd-lowest of these 6. Its average build year of 1955 against a peer-group mean of 1968 is 13 years older.

Showing the 5 closest of 103 Kansas counties eligible for comparison.

Bridge inventory size and condition shares for Hamilton County and the 5 Kansas counties closest to it in inventory size
County Bridges Poor
Finney County 78 2.6%
Kearny County 72 0%
Edwards County 69 4.3%
Hamilton County (this page) 68 0%
Gray County 66 0%
Logan County 55 3.6%

Each share is of that county's own total tracked bridges; peers are the counties with 5 or more bridges whose inventory size is closest to Hamilton County's. Source: FHWA National Bridge Inventory, 2024 release.

Nationwide counties with similar inventory size or average build year

Two NBI-derived peer sets for Hamilton County, both outside Kansas so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside KS (68 bridges here).

Similar average build year

Nearest mean year-built outside KS (1955 here).

Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.

All 68 Good 60 Fair 8 Poor 0

All bridges (68)

RS 308 RD B

Fair

Over: ARKANSAS RIVER

1.0S OF COOLIDGE, Hamilton, KS

Built 1962 Load: 8.3 t ADT: 310

RS 478 RD I

Fair

Over: NORTH BEAR CREEK

11.0S 7.0W OF SYRACUSE, Hamilton, KS

Built 1966 Load: 13.9 t ADT: 85

RS 308 RD B

Fair

Over: UNNAMED STREAM

7.0S OF COOLIDGE, Hamilton, KS

Built 1959 Load: 16.5 t ADT: 200

MINOR COL #2 RD Q

Fair

Over: SAND CREEK

6.0N 1.0E OF SYRACUSE, Hamilton, KS

Built 1964 Load: 19.2 t ADT: 45

RS 308 RD B

Fair

Over: UNNAMED STREAM

13.0S OF COOLIDGE, Hamilton, KS

Built 1950 Load: 19.6 t ADT: 50

US50 HWY

Fair

Over: SHIRLEY CREEK

11.18 MI E K27 EJCT, Hamilton, KS

Built 1931 Load: 25.3 t ADT: 2,200

K27 HWY

Fair

Over: ARKANSAS RIVER

15.77 MI N S CO LINE, Hamilton, KS

Built 1952 Load: 29.0 t ADT: 2,700

RS 927 RD 25

Fair

Over: UNNAMED STREAM

4.0S 6.0W OF SYRACUSE, Hamilton, KS

Built 1955 Load: 32.7 t ADT: 90

RS 927 RD 25

Good

Over: UNNAMED STREAM

4.0S 8.0W OF SYRACUSE, Hamilton, KS

Built 1965 Load: 12.4 t ADT: 100

US50 HWY

Good

Over: ARKANSAS RIVER DRAINAGE

2.11 MI E K27, Hamilton, KS

Built 1933 Load: 12.7 t ADT: 2,200

K27 HWY

Good

Over: MATTOX DRAW

1.15 MI S GREELEY COLN, Hamilton, KS

Built 1935 Load: 13.6 t ADT: 870

US50 HWY

Good

Over: BRIDGE CREEK

1.39 MI E COLO. STATE LN, Hamilton, KS

Built 1937 Load: 14.5 t ADT: 1,910

US50 HWY

Good

Over: ARKANSAS RIVER DRAINAGE

12.37MI E COLO. STATE LN, Hamilton, KS

Built 1939 Load: 14.5 t ADT: 2,420

US50 HWY

Good

Over: ARKANSAS RIVER DRAINAGE

8.38 MI E COLO. STATE LN, Hamilton, KS

Built 1939 Load: 15.4 t ADT: 2,420

RS 1526 7th Road

Good

Over: UNNAMED STREAM

17.0N 2.0W OF KENDALL, Hamilton, KS

Built 1965 Load: 15.5 t ADT: 15

K27 HWY

Good

Over: ARKANSAS RIVER DRAINAGE

10.44 MI N S CO LINE, Hamilton, KS

Built 1965 Load: 16.3 t ADT: 1,710

US50 HWY

Good

Over: SPRING CREEK

0.69 MI E COLO. STATE LN, Hamilton, KS

Built 1937 Load: 16.3 t ADT: 1,910

US50 HWY

Good

Over: FRONTIER DITCH OVERFLOW

0.85 MI E COLO. STATE LN, Hamilton, KS

Built 1937 Load: 16.3 t ADT: 1,910

US50 HWY

Good

Over: ALAMO DITCH OVERFLOW

11.34MI E COLO. STATE LN, Hamilton, KS

Built 1939 Load: 16.3 t ADT: 2,420

US50 HWY

Good

Over: ALAMO DITCH OVERFLOW

11.68MI E COLO. STATE LN, Hamilton, KS

Built 1939 Load: 16.3 t ADT: 2,420

US50 HWY

Good

Over: ALAMO DITCH OVERFLOW

11.98MI E COLO. STATE LN, Hamilton, KS

Built 1939 Load: 16.3 t ADT: 2,420

US50 HWY

Good

Over: PLUM CREEK

12.95MI E COLO. STATE LN, Hamilton, KS

Built 1939 Load: 16.3 t ADT: 2,710

US50 HWY

Good

Over: ARKANSAS RIVER DRAINAGE

6.54 MI E K27, Hamilton, KS

Built 1933 Load: 16.3 t ADT: 2,200

US50 HWY

Good

Over: ARKANSAS RIVER DRAINAGE

6.97 MI E K27, Hamilton, KS

Built 1933 Load: 16.3 t ADT: 2,200

RS 308 RD31

Good

Over: NORTH BEAR CREEK

10.0S 7.9W OF SYRACUSE, Hamilton, KS

Built 1959 Load: 16.6 t ADT: 485

K27 HWY

Good

Over: LITTLE BEAR CREEK DRG.

2.86 MI N S CO LINE, Hamilton, KS

Built 1965 Load: 17.2 t ADT: 1,620

US50 HWY

Good

Over: ARKANSAS RIVER DRAINAGE

1.77 MI E COLO. STATE LN, Hamilton, KS

Built 1937 Load: 17.2 t ADT: 2,160

US50 HWY

Good

Over: ARKANSAS RIVER DRAINAGE

5.77 MI E K27, Hamilton, KS

Built 1933 Load: 17.2 t ADT: 2,200

RS 1526 RD C

Good

Over: SPRING CREEK

7.0N OF COOLIDGE, Hamilton, KS

Built 1956 Load: 17.3 t ADT: 30

AA Road

Good

Over: TRIB. TO MATTOX DRAW

16.5N OF KENDALL, Hamilton, KS

Built 1968 Load: 17.6 t ADT: 20

RS 308 RD 31

Good

Over: TRIB. TO NORTH BEAR CK.

10.0S 7.5W OF SYRACUSE, Hamilton, KS

Built 1959 Load: 18.1 t ADT: 485

RS 927 RD 25

Good

Over: UNNAMED STREAM

9.0S 1.0E OF COOLIDGE, Hamilton, KS

Built 1970 Load: 18.1 t ADT: 100

US50 HWY

Good

Over: ARKANSAS RIVER DRAINAGE

2.72 MI E COLO. STATE LN, Hamilton, KS

Built 1937 Load: 18.1 t ADT: 2,420

US50 HWY

Good

Over: ARKANSAS RIVER DRAINAGE

13.94MI E COLO. STATE LN, Hamilton, KS

Built 1939 Load: 18.1 t ADT: 2,710

US50 HWY

Good

Over: ARKANSAS RIVER DRAINAGE

2.64 MI E K27, Hamilton, KS

Built 1933 Load: 18.1 t ADT: 2,200

SIDE RD LT (U RD)

Good

Over: ARKANSAS RIVER DRAINAGE

5.73 MI E K27 SDRD LT, Hamilton, KS

Built 1961 Load: 18.1 t ADT: 12

ENTR. LEFT

Good

Over: FT AUBREY DITCH OV FL

7.81 MI E K27 ENTR LT, Hamilton, KS

Built 1961 Load: 18.1 t

US50 HWY

Good

Over: SHIRLEY CREEK DRAINAGE

10.28 MI E K27, Hamilton, KS

Built 1961 Load: 18.1 t ADT: 2,200

RS 1526 MAIN ST

Good

Over: IRRIGATION DITCH

N. EDGE OF COOLIDGE, Hamilton, KS

Built 1965 Load: 18.4 t ADT: 45

RS 1526 RD 7

Good

Over: TRIB. TO EAST BRIDGE CK.

9.0N 5.0E OF COOLIDGE, Hamilton, KS

Built 1956 Load: 18.7 t ADT: 5

RS 2213 RD J

Good

Over: TRIB. TO E. BRIDGE CREEK

7.0N 6.0W OF SYRACUSE, Hamilton, KS

Built 1967 Load: 18.7 t ADT: 20

K27 HWY

Good

Over: LITTLE BEAR CREEK DRG.

5.29 MI N S CO LINE, Hamilton, KS

Built 1934 Load: 19.1 t ADT: 1,620

US50 HWY

Good

Over: ARKANSAS RIVER DRAINAGE

2.93 MI E COLO. STATE LN, Hamilton, KS

Built 1937 Load: 19.1 t ADT: 2,420

US50 HWY

Good

Over: ARKANSAS RIVER DRAINAGE

5.75 MI E COLO. STATE LN, Hamilton, KS

Built 1939 Load: 19.1 t ADT: 2,420

US50 HWY

Good

Over: FRONTIER DITCH

6.61 MI E COLO. STATE LN, Hamilton, KS

Built 1939 Load: 19.1 t ADT: 2,420

ENTR. LT

Good

Over: ARKANSAS RIVER DRAINAGE

2.22 MI E K27 ENTR. LT, Hamilton, KS

Built 1961 Load: 19.1 t

K27 HWY

Good

Over: SAND CREEK

9.21 MI N US50, Hamilton, KS

Built 1961 Load: 20.0 t ADT: 870

US50 HWY

Good

Over: ARKANSAS RIVER DRAINAGE

10.03MI E COLO. STATE LN, Hamilton, KS

Built 1939 Load: 20.0 t ADT: 2,420

US50 HWY

Good

Over: ARKANSAS RIVER DRAINAGE

1.04 MI E K27, Hamilton, KS

Built 1933 Load: 20.0 t ADT: 2,640

RS 308 RD B

Good

Over: TRIB. TO ARKANSAS RIV.

0.5S OF COOLIDGE, Hamilton, KS

Built 1962 Load: 20.6 t ADT: 310

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

Related

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Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.