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COMMERCIAL STATISTICS.

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

Vessel classification. American licensed river steamers..

7 Net registered tonnage..

1,585 Passengers..

6,000

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Total.....

77,351

369, 404

Average haul on portion of river under improvement, 8 miles; total average haul on rivers, 52 miles.

UU9.

GAUGING WATERS OF COLUMBIA RIVER.

OPERATIONS DURING THE FISCAL YEAR 1911.

Gauges were established during March, 1911, as follows: One on the Willamette at Linnton; one at the mouth of the Willamette and nine on the Columbia River at the following points: Willow Bar, Warrior Rock, Martins Bluff, Kalama, Slaughters Bar, Stella, Waterford, Cathlamet, and Elliotts Point. Readings were commenced at the above stations on May 15, 1911.

The gauges are all staff gauges, and were set as nearly right as possible. A concrete bench mark was set at each station, and its elevation above the zero of the gauge determined. The zero of the gauge at each point is to correspond with low water in the river at that point.

When sufficient readings have been taken these gauges will be corrected where necessary and connected by a line of levels to determine the slope of the river. Current measurements will be taken later and the discharge at different stages determined.

Estimate of additional funds required.
Amount that can be profitably expended in fiscal year ending June 30, 1913,

for maintenance of improvement..

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APPROPRIATIONS.

Total amount appropriated to June 13, 1902 (see H. Doc. No. 421,57th Cong.,

2d sess.).. Mar. 3, 1905.. June 25, 1910. Feb. 27, 1911..

$9,000 1,000 1,000 1,000

Total...

12,000

1 Exclusive of the balance unexpended July 1, 1911. 10822°--ENG 1911—-175

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