Idaho State Highway 78

State Highway 78 (SH-78) is a state highway in Idaho from SH-55 in Marsing to I-84 Business Loop in Hammett

State Highway 78
SH-55 highlighted in red
Route information
Maintained by ITD
Length	99.720 mi[1] (160.484 km)
Major junctions
West end	SH-55 in Marsing
	SH-45 near Walters Ferry SH-167 near Grand View SH-51 near Bruneau
East end	I-84 BL in Hammett
Location
Counties	Owyhee, Elmore
Highway system
State Highways in Idaho Interstate U.S. State ← SH-77 → SH-79

Route description

SH-78 starts at the intersection with SH-55 in Marsing and provides access to sites south of the Snake River from there to Bruneau and a few along the north side via SH-167 from Grand View. SH-78 provides access to Bruneau Dunes State Park and itself crosses the Snake into Elmore County before reaching its eastern terminus at Hammett.[1]

History

The basic route of today's SH-78 from Marsing to Bruneau was in place as early as the mid-1930s, mostly as unimproved roads with a few all-weather gravel segments near Bruneau, Grand View and north of Murphy (a segment originally part of SH-45), and some paved segments near Marsing as of the 1937 map.[2]

Major junctions

County	Location	mi[1]	km	Destinations	Notes
Owyhee	Marsing	0.000	0.000	SH-55 – Marsing, Nampa, Boise, Eagle	US-95 is about 2 miles (3.2 km) south on SH-55
	​	19.775	31.825	SH-45 north – Nampa
	Murphy	34.105	54.887	Silver City Road	National historic mining district and former Owyhee County seat about 25 miles (40 km) south
	Grand View	59.782	96.210	SH-167 north – Mountain Home AFB, Mountain Home	Access to Simplot feed lot, USAF Recreation Area at C. J. Strike Dam, Simco Road
	​	76.004	122.317	SH-51 south – Grasmere, Elko	Southern end of SH-51 overlap
	Bruneau	82.680	133.061	SH-51 north – Mountain Home	Northern end of SH-51 overlap
		84.360	135.764	Bruneau Dunes State Park	protected sand dunes
Snake River		94.664	152.347	Snake River Bridge Owyhee–Elmore county line
Elmore	Hammett	98.640– 99.720	158.746– 160.484	I-84 BL – Mountain Home, Boise, Twin Falls	Overlap with I-84 Bus.
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus

References

1. Staff (March 19, 2014). "State Highway 78 Milepoint Log" (PDF). Idaho Transportation Department. Archived from the original (PDF) on June 16, 2015. Retrieved February 3, 2015.
2. Rand McNally and Company, Road map: Idaho, Mont., Wyo., published by Texaco, 1937