page 1020

In presenting its report the Board deems it best to discuss each bar separately, beginning at Portland and proceeding toward the mouth of the Columbia. Opposite Portland the channel of the Willamette River presents a depth of from 20 to 40 feet...

page 1021

its greater width, than to the north channel, yet, although the flow of water through both channels has been greatly increased by the additional height of the river, the relative increase of flow has been in favor of the north channel. This is...

page 1022

The fall in the Willamette River during low-water is as follows: Calling the zero of the gauge at the foot of Yamhill street, Portland, 100,000 during low-water, the gauge at Portland reading 3 feet, the elevations at different points are as...

page 1023

It is believed that after the completion of such a dike further dredging will be unnecessary at Post-Office Bar. From the lower end of this bar there is a channel with a depth of from 20 to 45 feet, until we reach the mouth of the Willamette...

page 1024

Nigger Tom upper dike, 2, 300 feet long, 12,000 cubic yards, at $1.50 $18, 000 00 Nigger Tom lower dike, 600 feet long, 8,000 cubic yards, at $1.50 12,000 00 Nigger Tom revetment, 2,000 feet, at $4.50 per foot 9,000 00 Total 100,950 00...

page 1025

The Board, Lieutenant-Colonel Stewart dissenting, presents this plan as the best under present circumstances, believing that it will cut out and keep open a channel through the bar at this its narrowest and deepest part. At the same time it deems...

Appendix JJ2

of the Lower Willamette and Columbia Rivers, is approved, and the conclusions of the Board concurred in. Future appropriations for these works will, therefore, be expended in accordance with the plans and recommendations therein set forth. In...

Appendix JJ2

of the Lower Willamette and Columbia Rivers, is approved, and the conclusions of the Board concurred in. Future appropriations for these works will, therefore, be expended in accordance with the plans and recommendations therein set forth. In...

page 1027

regimen of the river becomes nearer fixed, I would not recommend that this plan be adopted. I think, however, that if the water should be partially controlled by cutting off certain sloughs and by building a few wing-dams in the vicinity of the...

page 1028

vey made of the whole river between Corvallis and Portland before offering any detailed and elaborate plan for the permanent contraction of the channel. After the completion of work this season, and removing certain rocks above Oregon City...

page 1029

(concave) the bank is 15 feet high, and of sandy soil, overlying gravel which is from 3 to 5 feet thick ; under this is a hard-pan, a ledge of which extends out into the river. On the opposite side the bank is low and shelving, composed of loose...

page 1030

miles an hour, and before the gap could be closed made a cut 11 feet deep, and damaged his work very much. Assistant Engineer Habersham was at once sent to the locality, and with his energetic assistance, after changing somewhat the general...

page 1031

the gravel-bar at the head of the east channel rests, while the island between the two channels is a deposit of gravel and alluvium dropped below the ledge by the current, and afterward overgrown by vegetation. The gradual growth of this island...

page 1032

GERVAIS SLOUGH, about 18 miles below Salem, is now the only channel at low water, the crooked arm formerly the principal channel, known as Biterman's Bend, having become closed by drift and gravel-bars. During the past winter the floods...

page 1033

a channel 75 feet wide can be obtained by removing about 300 cubic yards of rock, which can be blown off into deep water, and the channel raked. The foregoing completes the list of impediments to navigation between Corvallis and Oregon City. A...

page 1034

changed, crossing the bars at points where formerly there was from 6 to 12 inches of water only. The total work under contract consisted, therefore, in constructing 4,732 feet of dams, and excavating 71 1/4 cubic yards of rock. THE UNITED STATES...

Upper Willamette River--Half-Moon-Bend Bar

UPPER WILLAMETTE RIVER. HALF-MOON-BEND BAR. Former principal channel, now dry except during the hlqher stages, and partially overgrown by young willows. Showing the dams built during the low water stage of 1876 under the direction...

Upper Willamette River--Bower's Bar

UPPER WILLAMETTE RIVER. BOWER'S BAR Showing the dam built during the low water season of 1876 under the direction of Major John M. Wilson, Corps of Engineers, U.S.A. Steamboat Channel Very Little Channel Drawn by Robt. A. Habersham,...

Upper Willamette River--Pine Tree Bar

UPPER WILLAMETTE RIVER. PINE TREE BAR Steamboat Channel Gravel Showing the dams built during the low water stage of 1876 under the direction of Major John M. Wilson, Corps of Engineers, U.S.A. Drawn by Robt. A. Habersham, Asst. Engr.

Upper Willamette River--Upper Fickels Bar

UPPER WILLAMETTE RIVER. UPPER FICKELS BAR Former Steamboat Channel Gravel bank Former Channel Showing the dams built during the low water stage of 1876 under the direction of Major John M. Wilson, Corps of Engineers, U.S.A. Drawn by...

Upper Willamette River--Lower Fickels Bar

UPPER WILLAMETTE RIVER. LOWER FICKELS BAR. Present Channel Former Channel Black Dog Slough Dam Showing the dams built during the low water stage of 1876 under the direction of Major John M. Wilson, Corps of Engineers, U.S.A. Drawn by...

Upper Willamette River--Buena-Vista Bar

UPPER WILLAMETTE RIVER. BUENA-VISTA BAR. Showing the dams built during the low water stage of 1876 under the direction of Major John M. Wilson, Corps of Engineers, U.S.A. Present Channel Shoal from 6 to 16 inches deep Drawn by...

Upper Willamette River--Long Crossing Bar

UPPER WILLAMETTE RIVER. LONG CROSSING BAR Present Channel Former Channel Note: The sketch represent the bar before the dams were built. The figures show the depth in September in the new channel. Showing the dams built during the low...

Upper Willamette River--Humphreys' Rocks

UPPER WILLAMETTE RIVER. HUMPHREYS' ROCKS. Reef removed 47 Cub. Yds. Steamboat Channel Old Dam Showing the dams built during the low water stage of 1876 under the direction of Major John M. Wilson, Corps of Engineers, U.S.A.

Upper Willamette River--Rocky Rapid

UPPER WILLAMETTE RIVER. ROCKY RAPID. Showing the dams built during the low water stage of 1876 under the direction of Major John M. Wilson, Corps of Engineers, U.S.A. Surveyed and drawn by Robt. A. Habersham, Asst. Engr. Note....