During August 900 cubic yards of material were removed from the bar at the head of.the Clackamas Rapids by a hired dredge and labor at a cost of $390.·

During the fiscal year 243,124 cubic yards of material were dredged from the river between Portland and Milwaukee by private parties. A 35-foot gasoline launch was constructed and placed in commission in October at a cost of $2,200. The launch has been used as a tender to the dredges and for dispatch and survey work on the river. Estimate of additional funds required.

Amount that can be profitably expended in fiscal year ending June 30, 1913, for works of improvement and for maintenance..

1

$40,000

APPROPRIATIONS.

Appropriated prior to adoption of the present project (see H. Doc. No.

421, 57th Cong., 2d sess.)..

Apr. 28, 1904 (allotted June 3, 1904)..

Mar. 3, 1905.

$521,500.00 12, 000. 00 50,000.00

NOTE. By act of Mar. 3, 1899, $3,000 was transferred to and expended on Long Tom River, Oreg.

COMMERCIAL STATISTICS.

Season of navigation.-Year, 1910; opened, January 1, 1910; closed, December 31, 1910.

Average haul over portion of river under improvement, 70 miles. Total average haul on rivers, 70 miles.

UU 2.

OPERATING AND CARE OF LOCK AND DAM IN YAMHILL RIVER, OREG.

OPERATIONS DURING THE FISCAL YEAR 1911.

Operations during the year consisted in operating and keeping in repair the lock, dam, grounds, and Government plant and property connected therewith.

The lock was operated 44 times during the year, was closed to traffic during 45 days owing to high water, and was open during the remainder of the year.

No unusual repairs were needed, and the lock and connections were in good condition at the close of the year.

Summary of expenditures made in operating and caring for lock and dam in Yamhill River, Oreg., during the fiscal year ending June 30, 1911.

[Submitted in compliance with river and harbor act of July 5, 1884, and as amended by sec. 6 of the river and harbor act of Mar. 3, 1909.]

Office expenses, superintendence, and contingencies..

Labor..

Materials for repair, etc..

Total........

$122.50

864.75

11.95

999. 20

ALLOTMENTS.

COMMERCIAL STATISTICS.

Statement showing traffic through lock and dam in Yamhill River, Oreg., during fiscal year ending June 30, 1911.

For history of this work, see current summary of this report.

OPERATIONS DURING THE FISCAL YEAR 1911.

The general project was adopted by the river and harbor act of June 25, 1910, and a survey was authorized under date of July 30, 1910. Work was commenced in the early part of September by one field. party engaged in making a survey and obtaining data for use in compiling report. The field work was completed in October and the work of compiling maps and estimates was completed and report of survey, with estimate of cost, submitted on April 24, 1911.

June 25, 1910....

APPROPRIATION.

COMMERCIAL STATISTICS.

$300,000

Statement of traffic passing through the locks of the Willamette River at Oregon City, Öreg., during the calender year 1910.

[Submitted by Portland Railway, Light & Power Co., owners.]

UU 4.

IMPROVEMENT OF COLUMBIA AND LOWER WILLAMETTE RIVERS BELOW PORTLAND, OREG.

For history of this work, projects, and results accomplished, see current summary of this report.

OPERATIONS DURING THE FISCAL YEAR 1911.

Operations during the fiscal year have consisted principally in dredging for maintenance of the channel between Portland and Astoria. The dredge Clatsop worked throughout the year at various bars between Mount Coffin and Astoria, removing a total of 2,353,626 cubic yards of material from the channel and depositing it in deep holes outside the channel. The depths over the different shoals were increased from 2 to 5 feet. Details of the work are shown in Tables 1 and 2 herewith.

The dredge Chinook, when not at work on the bar, worked in the ship channel between Fort Stevens and Astoria and at Upper Sands above Astoria, removing a total of 510,351 cubic yards in 98 working days. For details of her work, see Table No. 4.

Under lease dated April 7, 1911, entered into with the port of Portland commission, the 30-inch dredge Columbia was engaged from April 20 to the end of the fiscal year in dredging a channel 8 feet deep on the west side of Swan Island, Willamette River, for use of log tows and shoal-water boats. A total of 634,800 cubic yards were removed. The dredge was hired at $350 per working day of 20 hours, an average of 4 hours per day being allowed for necessary repairs. For details of operations, see Table No. 3 herewith.

The dredges Columbia and Portland, belonging to the port of Portland commission, were also operated in the main ship channel, the expense being borne by the commission. Their reports indicate a total of 1,755,792 cubic yards excavated from the shoals between Portland and Slaughters and that the ruling depth obtained was 26 feet at mean low tide.

Considerable work was done at the United States moorings in making changes and repairs to dredges and other plant. With the increase in the amount of floating plant, some additions and improvements in the facilities at the moorings will be needed in the near future.

Model barge A was thoroughly overhauled and repaired at a cost of about $2,900 and model barge B is undergoing repairs, one-half of the cost of the work on the barges being charged to improving the mouth of the river.

A fuel-oil station was erected on the Three Tree Point Military Reservation, about 20 miles above Astoria, for supplying the dredges with fuel. The station includes a 10,000-barrel oil tank, with an 8-inch filling and discharge pipe carried on a dock 560 feet long, the dock having dolphins, etc., arranged so as to provide a convenient landing place for dredges and other vessels; a 10,000-gallon water tank filled from springs on the hills and having a 3-inch pipe extending to end of dock; a boiler house, equipped for heating the oil in cool weather; and a small residence for the use of the caretaker. The total cost of the station was approximately $13,000, one-half

of which was charged to improving the mouth of the Columbia and one-half to the ship channel.

The usual low-water surveys of the bars were not required during the fiscal year, as the conditions had undergone little change since the surveys were made the year before to secure data for the preparation of the 30-foot project.

The channel in the lower Columbia and Willamette Rivers continues to improve, the ruling depth between Portland and the sea being about 24 feet at low water at the end of the year. The port of Portland commission systematically dredges to a greater depth each time a cut is made through the bars and the river appears to adapt itself to the new depths, which do not seem to deteriorate any faster than the old ones. The commission has had plans prepared for another 30-inch pipe-line dredge to increase its dredging plant. Plans and specifications have been prepared in this office for a new hull for the tug G. H. Mendell.

Plans and specifications were prepared for the necessary additions and alterations in U. S. dredge Clatsop to change her from a coal to a fuel-oil burner. The work was advertised twice, but the bids were rejected on account of excessive price. At the end of the year the work had not been commenced.

As authorized by the act of February 27, 1911, the work of preparing plans and specifications for two new dredging plants for the ship channel has been commenced.

TABLE 1.-Work done by dredge Clatsop during fiscal year ending June 30, 1911.

TABLE 2.-Cost of dredging by the U. S. dredge Clatsop, including operating expenses,

wages, subsistence, fuel, etc.

Amount of material removed...

Operating expenses, wages, subsistence, current repairs, etc..

4,641 tons Aberdare coal, at $6.80....

...cubic yards.. 2, 353, 626