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Trunk Highway 78
Trunk Highway 78
	MN 78 highlighted in red
Route information
	Maintained by MnDOT
Length	46.694 mi (75.147 km)
Existed	1933–present
Major junctions
South end	MN 79 near Erdahl
	I-94 / US 52 near Ashby ; MN 210 at Battle Lake; MN 108 at Ottertail; MN 108 near Perham
North end	US 10 at Perham
Location
Country	United States
State	Minnesota
Counties	Grant, Douglas, Otter Tail
Highway system
	Minnesota Trunk Highway System; Interstate; US; State; Legislative; Scenic;

Minnesota State Highway 78 (MN 78) is a highway in west-central Minnesota, which runs from State Highway 79 near Erdahl and continues north to its northern terminus at its interchange with U.S. Highway 10 in Perham.

Route description

State Highway 78 serves as a north–south route in west-central Minnesota between Erdahl, Ashby, Battle Lake, Ottertail, and Perham.

Glendalough State Park is located 1.8 mile east of the junction of Highway 78 and County Road 16 near Battle Lake. The park entrance is located on County Road 16.
Minnesota DNR website for Glendalough State Park - Link

State Highway 78 was authorized in 1933.

The south portion of Highway 78 was still gravel in 1953. All of the route was paved by 1960.^[1]

Highway 78 was extended south from the interchange with Interstate Highway 94/US Highway 52 to Erdahl over part of CSAH 10 on June 1, 2020. In exchange, Minnesota State Highway 54 was turned back to Grant County, and is now CSAH 54.^[3]

County	Location	mi^[2]	km	Destinations	Notes
Grant	Erdahl Township			MN 79 / I-94 Alt. east – Elbow Lake, Erdahl
	Pelican Lake Township	0.000– 0.142	0.000– 0.229	I-94 (US 52)	Interchange; I-94 Exit 77
	Ashby	4.572	7.358	CSAH 82 / I-94 Alt. west – Evansville, Ashby	Former US 52
Otter Tail	Eagle Lake Township	11.947	19.227	CSAH 38 / Otter Trail Scenic Byway	South end of Otter Trail Scenic Byway overlap
	Eagle Lake Township	14.936	24.037	CSAH 12 / Otter Trail Scenic Byway – Dalton	North end of Otter Trail Scenic Byway overlap
	Clitherall Township	21.543	34.670	MN 210 / Otter Trail Scenic Byway – Henning, Fergus Falls	South end of Otter Trail Scenic Byway overlap
	Everts Township	24.109	38.800	CSAH 16 (Pine to Prairie International Birding Trail) – Glendalough State Park
	Ottertail	36.379	58.546	MN 108 east (Main Street) – Henning	South end of MN 108 overlap
	Perham Township	45.493	73.214	MN 108 west – Dent, Pelican Rapids	North end of MN 108 overlap
	Perham Township	47.114– 47.265	75.823– 76.066	US 10 / CSAH 8 north / Otter Trail Scenic Byway – Wadena, Detroit Lakes	Interchange; north end of Otter Trail Scenic Byway overlap
1.000 mi = 1.609 km; 1.000 km = 0.621 mi Concurrency terminus