We are being asked about 4 old foundations located on an old dirt road
(Highland Valley Road)
above the Boise River on a bluff.  They are not large foundations, so
we are thinking they
are dynamite shed/structure foundations.  A modern topo map shows three
structures, but
actually there are four about 10 to 15 long, with approx. six inch
holes (vent) in the foundations.
The structures are spaced about 100 feet apart down the gravel road. 
They appear to be old enough 
since they are comprised of board formed concrete that has a fair
amount of lichen development. 

The gravel road is called Highland Valley Road, which may be associated
with the Highland 
Company, which operated a small dam upriver in the early 1900s to
produce power for likely 
their mining operations.

I have pictures/images of the foundations, if you have any knowledge of
dynamite structures,
and would be happy to email them.

We appreciate any help.  Thanks in advance.

John
Boise, ID

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