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
Length99.720 mi[1] (160.484 km)
Major junctions
West end SH-55 in Marsing
 
East end I-84 BL in Hammett
Location
CountiesOwyhee, Elmore
Highway system
  • State Highways in Idaho
SH-77SH-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

CountyLocationmi[1]kmDestinationsNotes
OwyheeMarsing0.0000.000 SH-55 Marsing, Nampa, Boise, EagleUS-95 is about 2 miles (3.2 km) south on SH-55
19.77531.825 SH-45 north Nampa
Murphy34.10554.887Silver City RoadNational historic mining district and former Owyhee County seat about 25 miles (40 km) south
Grand View59.78296.210 SH-167 north – Mountain Home AFB, Mountain HomeAccess to Simplot feed lot, USAF Recreation Area at C. J. Strike Dam, Simco Road
76.004122.317 SH-51 south Grasmere, ElkoSouthern end of SH-51 overlap
Bruneau82.680133.061 SH-51 north Mountain HomeNorthern end of SH-51 overlap
84.360135.764Bruneau Dunes State Parkprotected sand dunes
Snake River94.664152.347Snake River Bridge
Owyhee–Elmore county line
ElmoreHammett98.640–
99.720
158.746–
160.484
I-84 BL Mountain Home, Boise, Twin FallsOverlap with I-84 Bus.
1.000 mi = 1.609 km; 1.000 km = 0.621 mi
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References

KML is from Wikidata
  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
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