Slope County, North Dakota bridges

Slope County has 43 bridges and culverts in the National Bridge Inventory, the oldest built in 1933. None are rated poor. The most common type is culvert (56%).

Bridges: 43
Good: 84%
Fair: 16%
Poor: 0%; 0 bridges
Average age: 36.3 yrs
Posted or closed: 2

Map of bridges in Slope County

Green good, amber fair, red poor. Click a marker for details.

Search bridges in Slope County

Type at least two characters, or pick a condition or type, to search every bridge in the county.

Condition

Good84%(36)

Fair16%(7)

Poor0%(0)

When they were built

Bridges built per decade. Year built as recorded in the inventory; reconstruction years are not included.

Busiest

US Highway 85 over Creek
1,080 vehicles/day
Good
US Highway 85 over Branch-Cannonball River
1,010 vehicles/day
Good
US Highway 85 over Philbrick Creek
920 vehicles/day
Good
US Highway 12 over Little Missouri River
580 vehicles/day
Fair
US Highway 12 over Bnrr Separation
561 vehicles/day
Good

Longest

US Highway 12 over Little Missouri River
414 ft
Fair
US Highway 12 over Bnrr Separation
221 ft
Good
172nd Ave SW over Beaver Creek
200 ft
Fair
64th ST SW over Deep Creek
112 ft
Good
Nd Highway 21 over Cannonball River
105 ft
Good

Oldest

145th Ave SW over Creek
Built 1933
Fair
US Highway 85 over Philbrick Creek
Built 1937
Good
US Highway 12 over Little Missouri River
Built 1950
Fair
US Highway 12 over Branch of Beaver Creek
Built 1950
Fair
US Highway 67 over North Fork Cedar Creek
Built 1952
Good

All bridges in Slope County

Busiest first · showing 1–43 of 43

Bridges in Slope County
Bridge	Location	Built	Type	Length	Daily traffic	Condition
US Highway 85 over Creek No. 0085028837	12 North of US 12	1991	Culvert	21 ft	1,080	Good
US Highway 85 over Branch-Cannonball River No. 0085048305	2 South of Jct. Nd 21	1963	Slab	90 ft	1,010	Good
US Highway 85 over Philbrick Creek No. 0085054228	4 North of Jct. Nd 21	1937	Culvert	21 ft	920	Good
US Highway 12 over Little Missouri River No. 0012006555	At Marmarth	1950	Stringer/Multi-beam or Girder	414 ft	580	Fair
US Highway 12 over Bnrr Separation No. 0012005597	1 West of Marmarth	1984	Stringer/Multi-beam or Girder	221 ft	561	Good
US Highway 12 over Little Beaver Creek No. 0012004710	1 West of Marmarth	1987	Culvert	24 ft	520	Good
US Highway 12 over Branch of Beaver Creek No. 0012002450	3 West of Marmarth	1950	Culvert	21 ft	510	Fair
Nd Highway 21 over Creek No. 0021003425	1 West JCT Nd 67	2021	Culvert	26 ft	507	Good
Nd Highway 21 over Creek No. 0021010105	6 East of Jct. No 67	2021	Culvert	30 ft	507	Good
Nd Highway 21 over Creek No. 0021011734	8 East JCT Nd 67	2021	Culvert	36 ft	507	Good
Nd Highway 21 over Creek No. 0021007381	4 East of JCT US 85	2021	Culvert	48 ft	440	Good
Nd Highway 21 over Cannonball River No. 0021003078	3 East JCT US 85	1983	Box Beam or Girders - Single or Spread	105 ft	350	Good
172nd Ave SW over Beaver Creek No. 000000044106240	SW Outskirts of Marmarth	1955	Stringer/Multi-beam or Girder	200 ft	200	Fair
US Highway 67 over North Fork Cedar Creek No. 0067016894	11 South JCT Nd 21	1952	Culvert	33 ft	180	Good
Old Highway 16 over Creek No. 000000044103120	11.5 N 3 W of Marmarth	2010	Culvert	20 ft	100	Good
County Highway over Cannonball Creek No. 000000044103121	11 N 3 W of Marmarth	2012	Culvert	31 ft	100	Good
54th ST SW over Philbrick Creek No. 000000044149030	7 North 14 East of Amidon	1986	Box Beam or Girders - Single or Spread	82 ft	100	Good
County Highway over Trib of Cannonball River No. 000000044152050	4 North 16 East Amidon	2000	Culvert	21 ft	100	Good
County Highway over Trib of Cannonball River No. 000000044154050	4 North 19 East Amidon	2000	Culvert	23 ft	100	Fair
126th Ave SW over Cannonball River No. 000000044151030	7 North 16 East of Amidon	1991	Box Beam or Girders - Single or Spread	98 ft	65	Good
64th ST SW over Deep Creek No. 000000044125110	10 West of Amidon	1984	Box Beam or Girders - Single or Spread	112 ft	60	Good
County Highway over Creek No. 000000044126110	10 West of Amidon	1984	Culvert	24 ft	60	Good
County Highway over Sand Creek No. 000000044130100	6 West of Amidon	1983	Culvert	29 ft	60	Good
76th Street SW over Deep Creek No. 000000044129220	8 N 2.5 W of Bowman	1987	Tee Beam	50 ft	50	Good
130th Ave SW over North Fork Cedar Creek No. 000000044147210	11 South 12 East Amidon	1993	Box Beam or Girders - Single or Spread	40 ft	50	Good
128th Ave SW over N. Fork Cedar Creek No. 000000044149210	10 South 14 East Amidon	1990	Box Beam or Girders - Single or Spread	60 ft	50	Good
76th ST SW over North Fork Cedar Creek No. 000000044151210	11 South 15 East Amidon	1988	Box Beam or Girders - Single or Spread	60 ft	50	Good
71st ST SW over Chanta Peta Creek No. 000000044153170	7 South 18 East of Amidon	1985	Box Beam or Girders - Single or Spread	66 ft	50	Good
County Highway over Creek No. 000000044108230	1 Northeast of Marmarth	2016	Culvert	41 ft	45	Good
149th Ave. SW over Deep Creek No. 000000044128220	12 North 22 East Marmarth	1993	Culvert	29 ft	45	Good
East River Road over First Creek No. 000000044130040	6 North 6 West Amidon	1985	Box Beam or Girders - Single or Spread	70 ft	35	Good
County Highway over N. Fork Cedar Creek No. 000000044148190	9 South 12 East of Amidon	1995	Culvert	21 ft	35	Good
58th ST SW over Deep Creek No. 000000044124040	11 West 7 North of Amidon	1979	Tee Beam	100 ft	26	Fair
County Highway over N. Fork Cedar Creek No. 000000044147190	8 South 12 East Amidon	2016	Culvert	23 ft	26	Good
128th Ave SW over N. Fork Cannonball River No. 000000044149040	6 North 13 East of Amidon	1983	Box Beam or Girders - Single or Spread	90 ft	26	Good
County Highway over Chanta Peta Creek No. 000000044151160	5 South 16 East of Amidon	2016	Culvert	31 ft	26	Good
East River Road over Sand Creek No. 000000044127030	9 West 8 North of Amidon	2016	Culvert	44 ft	25	Good
70th ST SW over N Fork Cedar Creek No. 000000044143160	6 South 8 East of Amidon	1977	Culvert	32 ft	25	Good
County Highway over N Fork Cannonball River No. 000000044142100	7 East of Amidon	1992	Culvert	25 ft	24	Good
132nd Ave SW over N. Fork Cannonball River No. 000000044145060	4 North 10 East of Amidon	1998	Box Beam or Girders - Single or Spread	76 ft	24	Good
59th Street SW over Little Missouri River No. 000000044113050	22 West 5 North of Amidon	2002	Culvert	67 ft	20	Fair
154th Ave SW over West Fork Deep Creek No. 000000044123210	2 North 17 East Marmarth	1985	Box Beam or Girders - Single or Spread	66 ft	20	Good
145th Ave SW over Creek No. 000000044132151	6 South 3 West of Amidon	1933	Slab	24 ft	10	Fair

Structure types in Slope County

Culvert	24	55.8%
Box Beam or Girders - Single or Spread	12	27.9%
Stringer/Multi-beam or Girder	3	7.0%
Slab	2	4.7%
Tee Beam	2	4.7%