MACADAMIZING
One hundred and twelve miles of State roads have been surfaced with broken stone and gravel macadam. Practically all of this surfacing is sixteen feet wide; there are, however, a few short stretches of nine-foot width necessitated by the coming on of wet weather before the full sixteen-foot width could be completed. The total quantity of broken stone and gravel placed in these 112 miles of surface was 247,925 cubic yards, an average of 2,210 cubic yards per mile, which quantity of material per mile gives an average loose thickness of eight and one-half inches for macadam sixteen feet wide. The Department’s specifications call for a minimum thickness of six inches. In many places, however, particularly on the lower Columbia River work it was found necessary to place as much as eighteen and twenty-four inches of rock before a satisfactory foundation could be secured.
The sections upon which broken stone or gravel surfacing was placed are as follows:
| Clatsop County— | Miles | ||
| Astoria to Columbia County Line | 24.4 | ||
| Columbia County— | |||
| Clatsop County Line to Goble | 27.2 | ||
| Deschutes County— | |||
| Bend-Lapine Section (cinder macadam) | 12.5 | ||
| Douglas County— | |||
| Divide to Leona | 7.0 | ||
| Gilliam County— | |||
| Condon to Thirty Mile Creek | 6.7 | ||
| Hood River County— | |||
| Cascade Locks to Hood River | 18.0 | ||
| Jackson County— | |||
| Siskiyou Mountain Section | 6.5 | ||
| Lake County— | |||
| Lakeview-Paisley Section | 4.0 | ||
| Lane County— | |||
| Divide-Cottage Grove Section | 1.0 | ||
| Wheeler County— | |||
| Cummins Hill Section | 4.5 | ||
| Total miles of macadam surfacing | 111.8 | ||
A complete description of each of the above sections will be found in the chapter devoted to the county in which the work was performed.