County profile · official public datasets

Griggs County, ND

22 public highway bridges tracked in the FHWA National Bridge Inventory: 63.6% rated Good, 27.3% Fair, 9.1% Poor.

22
Public bridges: 63.6%
Good condition: 9.1%
Poor condition

The verdict

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

Griggs County posts a higher-than-median Poor-condition share among rated counties in the state across rated county bridge inventory.

30th
of 53 on Poor share: 9.1%
Poor-condition share: 22
public highway bridges: 1974
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.

Griggs County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Griggs County ranks #30 of 53 North Dakota counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 9.1%). Griggs County, North Dakota contains 22 public highway bridges. Roughly 63.6% are rated “Good,” 27.3% “Fair,” and 9.1% “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

Public highway bridges in Griggs County

Good condition

63.6%

14 of 22 rated 7-9

Fair condition

27.3%

6 of 22 rated 5-6

Poor condition

9.1%

2 of 22 rated 4 or below

In-state Poor-share rank

#30 of 53

Among North Dakota counties with 5+ bridges, lower share ranks better

Condition distribution

Share of 22 NBI-tracked bridges by lowest applicable component rating.

Good

63.6% (14)

Fair

27.3% (6)

Poor

9.1% (2)

Griggs County's Poor-condition bridges carry 48 vehicle crossings a day

That is 1.1% of the county's reported daily bridge traffic on 9.1% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 24 crossings a day against 269 for a Good-condition one. A Poor rating is a condition category, not a closure or a live safety judgement; it means the lowest applicable component rating is 4 or below.

Computed over the 22 of 22 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

27.3% of Griggs County's bridges have passed the 50-year mark

6 of the 22 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 63.6% 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.

One structure carries 50% of the county's Poor-condition bridge traffic

COUNTY HIGHWAY over BN RAILROAD, built 1924, carries 24 vehicles a day, the most of any Poor-rated structure here. The county's Poor-condition exposure is concentrated rather than evenly spread, so the 2-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 48 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1910s

1
1920s

2
1950s

1
1960s

1
1970s

7
1980s

6
1990s

2
2000s

1
2010s

1

What this shows Construction peaked in the 1970s, when 7 of the county's bridges still in the inventory were built, which is 31.8% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year (1974) matches the North Dakota average (1975).

How Griggs County compares with North Dakota's closest counties by inventory size

The 5 North Dakota counties nearest Griggs County in number of bridges, with their condition splits. Its 9.1% Poor share is the 5th-lowest of these 6. Its average build year of 1974 against a peer-group mean of 1974 is in line with the group.

Showing the 5 closest of 52 North Dakota counties eligible for comparison.

Bridge inventory size and condition shares for Griggs County and the 5 North Dakota counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Oliver County	24	41.7%	50%	8.3%	1974
Renville County	24	25%	66.7%	8.3%	1972
Nelson County	23	34.8%	47.8%	17.4%	1975
Sioux County	22	59.1%	36.4%	4.5%	1970
Griggs County (this page)	22	63.6%	27.3%	9.1%	1974
Foster County	19	47.4%	47.4%	5.3%	1980

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 Griggs 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 Griggs County, both outside North Dakota so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside ND (22 bridges here).

Glascock County, GA · 22 bridges
Scott County, KS · 22 bridges
Wichita County, KS · 22 bridges
Currituck County, NC · 22 bridges

Similar average build year

Nearest mean year-built outside ND (1974 here).

Knox County, TN · avg 1974 · 588 bridges
Summit County, OH · avg 1974 · 563 bridges
Onondaga County, NY · avg 1974 · 472 bridges
Orange County, NY · avg 1974 · 472 bridges

Poor

Over: BN RAILROAD

2 EAST 1 SOUTH HANNAFORD, Griggs, ND

Built 1924 Load: 23.8 t ADT: 24

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

Browse all → | Rankings →

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

Compiled by PlainBridges, Independent data publisher

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.

Griggs County, ND

Griggs County Bridge Snapshot

Condition distribution

Griggs County's Poor-condition bridges carry 48 vehicle crossings a day

27.3% of Griggs County's bridges have passed the 50-year mark

One structure carries 50% of the county's Poor-condition bridge traffic

When Griggs County's bridges were built

How Griggs County compares with North Dakota's closest counties by inventory size

Nationwide counties with similar inventory size or average build year

Similar inventory size

Similar average build year

All bridges (22)

TOWNSHIP ROAD

COUNTY HIGHWAY

COUNTY HIGHWAY

COUNTY HIGHWAY

ND HIGHWAY 45

COUNTY HIWAY 2004

COUNTY HIGHWAY

COUNTY HIWAY 2026

COUNTY HIGHWAY

COUNTY HIGHWAY

COUNTY HIGHWAY

COUNTY HIGHWAY2009

COUNTY HIGHWAY2026

TOWNSHIP ROAD

ND HIGHWAY 1

ND HIGHWAY 1

ND HIGHWAY 200

COUNTY HIGHWAY

COUNTY HIGHWAY

ND HIGHWAY 200

COUNTY HIGHWAY

COUNTY HIGHWAY

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