The 140 feet adjoining the bank is 3-row dike, the 200 feet following 4-row, and the remainder 3-row. All the piles are double braced in the manner shown in figs. 2 and 3, Pl. II. Cypress piles were used except for the 120 feet at the outer end, which are native oak. All piles were driven with a steam hammer.

Continuous work was prevented on account of having to remove the hammer to dike 34 to complete the sinking of piles started with the jet.

Dike 36.-Pile sinking was begun at the shore end of dike 36 September 7. The bottom being hard and the penetrations unsatisfactory, a steam hammer was substituted for the sinker and the latter moved farther out on the dike, where the bottom was less resisting. Two-thirds of the piles were driven with the hammer. The driving was slow, 600 to 700 blows being required to give penetrations of 21 feet. The piles used were principally native oak and were double braced. Work was suspended September 30, the dike having been carried 732 feet from shore to the steamboat channel, and completed that far except attaching some of the screening, which was done October 12 to 14.

The total number of piles driven and jetted for dike work during the fiscal year amounted to 3,426, of which 324 were mooring piles.

The number of piles placed in each dike by the above methods and the average penetrations of each dike are given below:

*Seventy-six piles, sunk to refusal by sinker, afterwards driven down by steam hammer.

The following table shows the extent of dike work completed:

9137 feet washed out, 107 feet of which were reconstructed as 4-row and 30 feet 3-row.

* These 27 piles were sunk with a jet but had to be tapped down with the hammer in order to secure the proper penetration.

Average cost of driving one mooring pile, $3.06. Total average cost of one mooring pile driven, $4.93+.

Average cost of sinking one mooring pile, $2.92-. Total average cost of one mooring pile sunk, $7.09+

Average cost of driving one dike pile, $1.40+. Total average cost of one dike pile driven, $6.94—.

Average cost of sinking one dik e pile, $1.58+. Total average cost of one dike pile sunk, $5.97+.

228

338

1. 165. 47

202.13

96

52

72

296. 17

94.24

190

320

1, 212.37

585.77

136

170

616. 29

212.44

175

220

924.28

288.18

Average cost of weaving 100 square feet, $1. 08+; total average cost of 100 square feet woven, $2. 31-. Detailed statement of ballasting foot mat.

Average cost of ballasting 100 square feet, $0.46-; total average cost of 100 square feet ballasted, $1.36-.

Detailed statement of bracing dikes.

Average cost of bracing 1 linear foot of dike $0.33-; total average cost of 1 linear foot of dike braced, $0.97-.

*The cable used for lashing dikes B and C was expended during the last fiscal year but was not attached until the beginning of this year.

Average cost of lashing 1 linear foot of dike, $0.10-; total average cost of 1 linear foot of dike lashed, 0.16-.

Average cost of screening 1 linear foot of dike, $0. 17—; total average cost of 1 linear foot of dike screened, $0.30+.

Résumé of cost of dike construction on Osage division, first reach, for fiscal year ending

June 30, 1894.