Idaho State Highway 78
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| Route information | |
| Maintained by ITD | |
| Length: | 99.720 mi (160.484 km) |
| Major junctions | |
| West end: |
 SH 55 in Marsing
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 SH 51
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| East end: |
 I-84 Business Loop in Hammett
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| Location | |
| Counties: | Owyhee, Elmore |
| Highway system | |
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State Highway 78 (SH-78) is a state highway in Idaho from SH-55 in Marsing to I-84 Business Loop in Hammett
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.
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.
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