Total bridges
272
Public highway bridges in Morton County
County profile · official public datasets
Morton County, ND
272 public highway bridges tracked in the FHWA National Bridge Inventory: 42.3% rated Good, 48.9% Fair, 8.8% Poor.
- 272
- Public bridges
- 42.3%
- Good condition
- 8.8%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Morton County posts a higher-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.
- 29th
- of 53 on Poor share
- 8.8%
- Poor-condition share
- 272
- public highway bridges
- 1971
- 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.
Morton County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Morton County ranks #29 of 53 North Dakota counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 8.8%). Morton County, North Dakota contains 272 public highway bridges. Roughly 42.3% are rated “Good,” 48.9% “Fair,” and 8.8% “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.
Good condition
42.3%
115 of 272 rated 7-9
Fair condition
48.9%
133 of 272 rated 5-6
Poor condition
8.8%
24 of 272 rated 4 or below
In-state Poor-share rank
#29 of 53
Among North Dakota counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 272 NBI-tracked bridges by lowest applicable component rating.
Good 42.3% (115)
Fair 48.9% (133)
Poor 8.8% (24)
Morton County's Poor-condition bridges carry 3,414 vehicle crossings a day
That is 1.2% of the county's reported daily bridge traffic on 8.5% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 148 crossings a day against 712 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 271 of 272 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
63.6% of Morton County's bridges have passed the 50-year mark
173 of the 272 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 42.3% 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 65.9% of the county's Poor-condition bridge traffic
INTERSTATE 94 over CO HWY RR/EAGLE NEST INT, built 1962, carries 2,250 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 24-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 3,414 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Morton County's bridges were built
272 bridges with a recorded construction year, grouped by decade
- 1910s 9
1910–1919
9 bridges
- 1920s 2
1920–1929
2 bridges
- 1930s 9
1930–1939
9 bridges
- 1940s 21
1940–1949
21 bridges
- 1950s 22
1950–1959
22 bridges
- 1960s
1960–1969
76 bridges
- 1970s
1970–1979
46 bridges
- 1980s 29
1980–1989
29 bridges
- 1990s 21
1990–1999
21 bridges
- 2000s 16
2000–2009
16 bridges
- 2010s 11
2010–2019
11 bridges
- 2020s 10
2020–2029
10 bridges
What this shows Construction peaked in the 1960s, when 76 of the county's bridges still in the inventory were built, which is 27.9% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year (1971) matches the North Dakota average (1975).
How Morton County compares with North Dakota's closest counties by inventory size
The 5 North Dakota counties nearest Morton County in number of bridges, with their condition splits. Its 8.8% Poor share is the 2nd-lowest of these 6. Its average build year of 1971 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.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Cass County | 369 | 52% | 43.4% | 4.6% | 1987 |
| Grand Forks County | 335 | 30.4% | 57% | 12.5% | 1974 |
| Morton County (this page) | 272 | 42.3% | 48.9% | 8.8% | 1971 |
| Walsh County | 257 | 30% | 50.2% | 19.8% | 1969 |
| Pembina County | 204 | 22.5% | 54.9% | 22.5% | 1969 |
| Richland County | 197 | 38.1% | 48.7% | 13.2% | 1971 |
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 Morton 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 Morton County, both outside North Dakota so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside ND (272 bridges here).
- Rock Island County, IL · 272 bridges
- Berrien County, MI · 272 bridges
- Bolivar County, MS · 272 bridges
- Blaine County, OK · 272 bridges
Similar average build year
Nearest mean year-built outside ND (1971 here).
- Wayne County, MI · avg 1971 · 1,026 bridges
- Baltimore County, MD · avg 1971 · 783 bridges
- Washington County, PA · avg 1971 · 655 bridges
- Linn County, OR · avg 1971 · 566 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Fair-condition bridges (133)
County Road 88
FairOver: DRAINAGE AREA
6 EAST 5 NORTH OF HEBRON, Morton, ND
Built 1971 Load: 34.7 t ADT: 85
34TH ST
FairOver: DRAINAGE AREA
7 EAST 2 NORTH OF HEBRON, Morton, ND
Built 1968 Load: 35.3 t ADT: 25
24th Street
FairOver: DRAINAGE AREA
8 EAST 2 NORTH OF HEBRON, Morton, ND
Built 1973 Load: 35.3 t ADT: 25
COUNTY HIGHWAY
FairOver: I-94/HEBRON INTERCHANGE
12 EAST OF ND 8, Morton, ND
Built 1961 Load: 35.7 t ADT: 320
75th Ave
FairOver: DRAINAGE AREA
1 EAST 7 SOUTH OF HEBRON, Morton, ND
Built 1970 Load: 35.9 t ADT: 25
ND HIGHWAY
FairOver: I-94/ND 31 INTERCHANGE
JUNCTION OF ND 31 & I-94, Morton, ND
Built 1964 Load: 36.1 t ADT: 1,900
COUNTY HIGHWAY 139
FairOver: SWEET BRIAR CREEK
2 NORTH 2 EAST OF JUDSON, Morton, ND
Built 1964 Load: 36.2 t ADT: 405
INTERSTATE 94
FairOver: BNRR AND MISSOURI ROAD
5 WEST OF US 83 NORTH, Morton, ND
Built 1964 Load: 36.2 t ADT: 7,750
INTERSTATE 94
FairOver: BNRR AND MISSOURI ROAD
5 WEST OF US 83 NORTH, Morton, ND
Built 1964 Load: 36.5 t ADT: 7,750
COUNTY HIGHWAY
FairOver: I-94/GLEN ULLIN INT
2 WEST OF ND 49, Morton, ND
Built 1961 Load: 37.3 t ADT: 380
INTERSTATE 94
FairOver: CO HWY/ROSEBUD SEPARATIO
4 EAST OF ND 31, Morton, ND
Built 1964 Load: 37.3 t ADT: 3,250
INTERSTATE 94
FairOver: ROSEBUD SEPARATION
4 EAST OF ND 31, Morton, ND
Built 1964 Load: 37.3 t ADT: 3,250
ND HIGHWAY 31
FairOver: SWEET BRIAR CREEK
6 NORTH OF I-94, Morton, ND
Built 1932 Load: 38.0 t ADT: 930
INTERSTATE 94
FairOver: COLLINS AVENUE
6 EAST OF ND 25, Morton, ND
Built 1964 Load: 38.4 t ADT: 6,350
INTERSTATE 94
FairOver: COLLINS AVENUE
6 EAST OF ND 25, Morton, ND
Built 1964 Load: 38.4 t ADT: 6,350
County Road 137
FairOver: CREEK
1 WEST OF ALMONT, Morton, ND
Built 1975 Load: 38.5 t ADT: 40
COUNTY HIGHWAY
FairOver: I-94/DENGATE INTERCHANGE
7 EAST OF ND 49, Morton, ND
Built 1960 Load: 38.6 t ADT: 55
INTERSTATE 94
FairOver: EAST MIDWAY INTERCHANGE
3 WEST OF US 83 NORTH, Morton, ND
Built 1965 Load: 39.6 t ADT: 9,100
INTERSTATE 94
FairOver: WILSON CREEK
4 EAST OF ND 49, Morton, ND
Built 1960 Load: 40.0 t ADT: 2,700
INTERSTATE 94
FairOver: WILSON CREEK
4 EAST OF ND 49, Morton, ND
Built 1960 Load: 40.0 t ADT: 2,700
35TH ST
FairOver: SQUARE BUTTE CREEK
1 WEST 5 NORTH MANDAN, Morton, ND
Built 2004 Load: 40.8 t ADT: 144
ND HIGHWAY 49
FairOver: HAYMARSH CREEK
1 SOUTH OF I-94, Morton, ND
Built 1959 Load: 43.5 t ADT: 860
INTERSTATE 194
FairOver: BUSINESS LOOP 94
2 EAST OF MANDAN, Morton, ND
Built 1981 Load: 43.5 t ADT: 18,200
COUNTY HIGHWAY
FairOver: I-94/CUSTER TOWNSHIP SEP
10 WEST OF ND 49, Morton, ND
Built 1961 Load: 44.8 t ADT: 25
INTERSTATE 94
FairOver: NORTH CREEK
2 WEST OF ND 49, Morton, ND
Built 1961 Load: 50.1 t ADT: 2,300
ND HIGHWAY
FairOver: I-94/ND 94 & ND 25 INT
JCT OF I-94 & ND 94 & 25, Morton, ND
Built 1964 Load: 54.7 t ADT: 1,850
INTERSTATE 194
FairOver: BUSINESS 94
1 SOUTHEAST JUNCT 194, Morton, ND
Built 1981 Load: 55.2 t ADT: 9,100
INTERSTATE 194
FairOver: BUSINESS 94
1 SOUTHEAST OF JUNCT 194, Morton, ND
Built 1981 Load: 55.2 t ADT: 9,100
COUNTY HIGHWAY
FairOver: I-94/JUDSON INTERCHANGE
6 EAST OF ND 31, Morton, ND
Built 1964 Load: 56.5 t ADT: 280
COUNTY HIGHWAY
FairOver: I-94/SWEET BRIAR SEP
8 EAST OF ND 31, Morton, ND
Built 1964 Load: 65.4 t ADT: 30
IRRSR ND HIGHWAY 6
FairOver: CANNONBALL RIVER
AT BREIEN, Morton, ND
Built 1984 Load: 68.9 t ADT: 535
ND HIGHWAY
FairOver: CREEK
4 NORTH OF I-94, Morton, ND
Built 1954 Load: 75.7 t ADT: 1,000
ND HIGHWAY 1806
FairOver: CREEK
6 SOUTH OF I-94, Morton, ND
Built 1966 Load: 99.9 t ADT: 2,450
Read our methodology - how this data is sourced, computed, and verified.
Related
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.