US Bridges

South Park Street over Branch of Knife River

PoorPosted for load

Morton County, North Dakota · City of Hebron · Structure no. 000000030103061

Built
1916
109 years old, rebuilt 1973
Condition
Poor
inspected September 2024
Type
Truss - Thru
Steel
Length
77 ft
1 main span
Daily traffic
200
2018 count
Owner
County
County Highway Agency

About this bridge

South Park Street over Branch of Knife River is a steel truss - thru carrying South Park Street over Branch of Knife River in Morton County, North Dakota. It was built in 1916 and reconstructed in 1973, so it is 109 years old, older than the North Dakota average of 48.2 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 200 vehicles a day, roughly 10% of them trucks, projected to reach 200 by 2038. The structure is 77 ft (23.5 m) long and 20 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesSouth Park Street
CrossesBranch of Knife River
LocationCity of Hebron
RouteCounty Highway 0
Coordinates46.89724, -102.0446
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Substructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating10.8 US tons
Inventory rating6.4 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length77 ft (23.5 m)
Longest span74 ft (22.6 m)
Deck width20 ft (6.1 m)
Roadway width17 ft (5.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic200 (2018)
Projected traffic200 by 2038
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusListed on the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$270,000
NavigationNo navigation control on waterway

Frequently asked questions

When was South Park Street over Branch of Knife River built?

It was built in 1916, making it 109 years old in 2025. It was reconstructed in 1973.

What condition is South Park Street over Branch of Knife River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2024.

How much traffic does South Park Street over Branch of Knife River carry?

About 200 vehicles per day (2018 count), of which roughly 10% are trucks.

How long is South Park Street over Branch of Knife River?

The structure is 77 ft (23.5 m) long with a longest span of 74 ft (22.6 m) and a deck 20 ft wide.

Who owns South Park Street over Branch of Knife River?

It is owned by the County Highway Agency.