Side slope on the right bank of the stream, from water's edge to break of bank (a distance of thirty-five (35) feet) (1) vertical in five (5) horizontal.

Height of top of right bank above surface of water when survey was made 7 feet.

Width of level portion of top of right bank 80 feet.

Falling slope back of right bank for a distance of eight hundred (800) feet averages four-tenths (0.4) of one per cent.

Then comes a dry, level slough, three hundred (300) feet wide; and, finally, there is a rising grade of seven-tenths (0.7) of one per cent for a distance of some eighteen hundred (1,800) feet.

A profile of the crossing is shown in Fig. 17a.

Average slope of river for first ten (10) miles up-stream is 1.37 feet per mile; and in each ten-mile stretch beyond it increases regularly by one and one-tenth (1.1) feet per mile.

The stream at times carries considerable drift, but there is no probability of the channel changing.

Borings near the water's edge on the right side, at time of survey, showed five (5) feet of silt, sixteen (16) feet of sand, running from fine at top to coarse at bottom, then gravel very fine at first but increasing in coarseness gradually with the depth, the vertical measurements being made from the elevation of the water.

Material of the low bank and of the flat is sandy loam covered with vegetation that would offer considerable resistance to scour. Across the slough the material is harder.

The crossing is near the middle of a long, easy bend in the stream; and the current at high water impinges against the rocky bank.

Highest water-mark found was about eight feet above the water level at time of survey. No reliable records of floods were obtainable.

Rainfall on watershed averages about forty-five (45) inches per annum.

Grade line on structure, twelve (12) feet above the extreme future high- water.

Clearance line for superstructure, at least four (4) feet above same.

Crossing is entirely on tangent and, as nearly as may be, at right angles to the current.

Superstructure is to be of steel, and substructure of concrete.

Piles may or may not be used for foundations.

The channel pier foundations must go to a depth of twelve (12) feet below greatest probable scour in case piles are employed, or twenty (20) feet below same in case that they are not.

Approaches are to be of earth embankment, but it is permissible to put in some wooden pile trestle across the slough, if investigation should indicate it to be necessary.