The Installation of the undercrossing structure was handled by the Southern Pacific Railway Company. The grading was handled by the County grading forces under the supervision of the Highway Department. Mr. F. H. Walker acted as resident engineer. The grading was commenced on January 7, 1918, and completed August 1, 1918. The total cost of the grading was $9,768.88, and was paid entirely from State funds. COST STATEMENT ASHLAND HILL GRADING Industrial insurance $ 156.27 Grading, labor, teams, material, etc. 8,928.19 Explosives 102.08 Concrete drainage structures 14.70 Pipe culverts 287.03 Irrigation flume diversions 5.40 --------- Total $ 9,493.67 Engineering 275.21 --------- Total cost $ 9,768.88 Ashland Hill Paving Bids were called for on August 6, 1918, for the paving of the Ashland Hill Section, but as no satisfactory bids were received the work was undertaken by the Highway Department with State forces. This section of paving is 4,200 feet in length, and the type of pavement laid is a 16-foot concrete, 5½ inches thick at the sides and 6½ inches thick at the center. The mixture was a 1:2:3½, and a ratio of 5.6 gallons of water per sack of cement was used. The average haul on material was 1.2 miles and hauling was done by means of trucks. The cement was shipped to the job prior to the beginning of construction and stored at convenient locations near the work. A sixteen cubic foot Koehring mixer equipped with boom and bucket was used for mixing the aggregate. The pavement, after being struck off, was finished by the roller and belt method. The pavement first being rolled from two to four times depending on the condition of the concrete and later belted with eight and ten inch belts. The eight inch belt being used first. A very satisfactory surface was obtained in this manner. [Illustration: CONCRETE PAVEMENT ON ASHLAND HILL IN JACKSON COUNTY, ON THE PACIFIC HIGHWAY NORTH OF ASHLAND. GRADED AND PAVED IN 1918] Continuous forms were used on this work and ¼x4 inch elastite joints were placed at 30 foot intervals, leaving approximately two inches of concrete above the elastite and giving the pavement the appearance of monolithic construction. It was found that a better riding pavement could be produced in this way as the inequalities at joints were eliminated and we believe that the use of this pavement will justify the adoption of this type on future work. Gravel and crushed rock shoulders two feet wide were built on this section and the pavement was not covered while curing as the weather was cool and damp. However, the pavement was kept wet by sprinkling when necessary.