newell.] UMATILLA RIVER, OREGON. 
Table of monthly discharges of Umatilla River at Pendleton, Oregon. 
[Total drainage area, 640 square miles.] 
69 
Month. 
January ... 
February . . 
March 
April 
May 
June 
July 
August 
September. 
October 
November. 
December. . 
Discharge. 
Maxi- 
mum. 
Sec. feet. 
1892. 
January . 
February 
March 
April 
May 
June 
J uly 
320 
2,250 
2,250 
520 
370 
770 
CO 
55 
65 
580 
520 
830 
2,030 
2, 800 
3,870 
3. 250 
920 
125 
Mini- 
mum. 
Mean. 
Sec. feet. Sec. feet. 
140 
140 
770 
140 
140 
60 
6C 
35 
35 
60 
410 
470 
630 
000 
000 
920 
125 
45 
180 
1,050 
1,430 
408 
202 
300 
60 
45 
50 
172 
510 
587 
1,120 
1,753 
1,706 
2,090 
455 
74 
Total lor 
month. 
Acre feet. 
9, 997 
64, 562 
85, 091 
25. 087 
12 020 
18, 446 
3,689 
2,678 
3,074 
10, 235 
31,359 
36, 093 
62, 202 
107, 788 
101,514 
128, 509 
27, 074 
4,550 
On January 9, 1893, Mr. William P. Trowbridge, jr., inspected this 
station and made a measurement of the discharge at that time, and 
also made arrangements for the continued reading of the river gage. 
Owing, however, to uncertainty as to paying necessary expenses, the 
records were not continued for a time sufficiently long to be of value. 
Mr. Trowbridge states that the bridge over the stream affords an 
excellent opportunity for measurements by means of current meters, 
as the stream at this point is narrow and is confined between a bigh 
clay and gravel bank on the north side and an embankment or levee on 
the south side. The latter was constructed by the town of Pendleton 
to prevent inundations, which have occurred at times of flood. The 
section here is good, as the bottom of the river is covered with pebbles 
and gravel, and apparently is not liable to change. At a point about 
60 feet from the south bank of the stream the bridge is supported by a 
tubular iron pier consisting of two cement tilled iron pipes of a diam- 
eter of about 30 inches. This pier offers an obstruction, but as the 
sidewalk of the bridge projects considerably upstream the meters can 
be used to advantage. A measurement made on January 14, L893, gave 
a discharge of 239 second-feet for a gage height of 1.53. The area of 
section was 126 square feet, the maximum velocity 3.07 feet per second, 
and the mean velocity 1.90 feet per second. 
At that time a report upon the Umatilla River, its tributaries, and 
the diversion of water for power and irrigation was made by Mr. Trow- 
bridge. The following extracts from this unpublished report give the 
principal facts, the maps and illustrations being omitted : 
Umatilla River beads in the Bine Mountains, in the northeastern part of the State 
of Oregon, and flows in a westerly direction into the Columbia River. The moan- 
