38 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
The temperature of the air seemed to have no perceptible daily, effect on the 
water in deep portions of the lake. From November 23 to 30 the air varied but little, 
from 20° to 29° being about the minimum and maximum height. During December 
from 45° to 48° was the approximate daily temperature. 
In depths over 150 feet the air ceased to have an effect on the water much below 
40 feet from the surface. In a few places 50 feet below the surface was reached before 
the temperature remained constant. In depths less than 100 the temperature was 
found constant about 30 feet below the surface. 
It will be noticed that in a number of places in depths ranging from 40 to over 
200 feet the temperature both at the surface and bottom is the same. Why this should 
be, when only a short distance away the difference between the surface and bottom is 
a degree or more, is not easily explained. 
Many of the temperatures and soundings taken are recorded in the following table : 
Soundings and temperatures taken in Lake Washington. 
Dae. 
Depth. 
Temperature 
at surface. 
Temperature 
at bottom. 
Position. 
Date. 
P< 
A 
Temperature 
at surface. 
Temperature : 
at bottom. 
Position. 
Feet. 
op. 
° F. 
Feet. 
° F. 
° F. 
Nov. 23 
35 
484 
48| 
300 feet from shore, near 
Dec. 19* 
50 
494 
46 
Close to shore east side of 
Madison-street boathouse. 
Mercer Island. 
A A [ 
Iu various parts of Union 
19 
58 
47 
46 
300 feet from shore and 
in 
1C ^ 
Bay, which is a part of 
near last sounding. 
24 
10 
45 
45} 
Lake AVashington. 
19 
674 
47 
46 
Halfway across channel 
25 
98 
48 
48 
One-fourth mile east of boat- 
between Mercer Island 
house. 
and east shore. 
25 
156 
48 
47 
One-fourth mile east of last 
19 
55 
47 
46 
Near the east side of lake. 
station. 
19 
12 
46 
45 
Close to shore. 
25 
162 
48 
47 
Middle of lake. 
20 
70 
46 
46 
Half a mile north of last 
25 
150 
48 
47 
Two-thirds across lake. 
sounding. 
25 
144 
48 
47 
One-eighth mile from east 
20 
87 
46 
46 
One-eighth mile west from 
side of lake. 
last sounding. 
25 
72 
48 
48 
300 feet from shore. 
20 
U5J 
46 
47 
Halfway across east end 
27 
14 
41 
41 
In Union Bay ; cold weather, 
Mercer Island to east 
air 28° and 30°. 
side of lake. 
27 
98 
47 
44 
Off mouth Union Bay. 
20 
174 
464 
46 
Halfway between Daphne 
28 
150 
47 
47 
Do. 
Point and north end Mer- 
28 
152 
47 
47 
Do. 
| cer Island. 
Dec. 1 
96 
47 
47 
Do. 
23 
204 
464 
454 
Half a mile east Webster 
1 
168 
47 
47 
14 mile SSE. from Madison- 
I Point. 
street boathouse. 
•23 
219 
464 
45J 
Half a mile north last 
1 
90 
47 
47 
\\ mile east from Yesler- 
I sounding. 
street boathouse. 
23 
201 
464 
45£ 
Half a mile northward last 
1 
114 
47 
46 
Two-thirds across i ake from 
sounding, 4 mile from 
pumping station to Mer- 
shore. 
cer Island. 
23 
66 
46 
46 
Third of mile north and 
1 
156 
47 
| 46 
One-halfmileoff waterworks. 
close to shore. 
18 
210 
40£ 
46 
One mile SE. from Madison- 
23 
584 
464 
464 
About 500 feet from Sand 
street boathouse. 
Point south near shore. 
18 
204 
46 
46 
One-fourth mile SE. from 
23 
105 
- 47 
46 
About 200 feet from Sand 
Madison-street boathouse. 
Point NE. 
18 
•218 
m 
1 46 
li mile SE. from Madison- 
23 
181 
464 
454 
Less than J mile NE. from 
street boathouse. 
last sounding. 
18 
204 
464 
46 
One-third of a mile SAV. of 
23 
168 
46J 
45 
Less than 4 mile in same 
Daphne Point. 
direction. 
18 
150 
46 
46 
One-eighth of a mile SW. 
23 
180 
464 
444 
About the same distance 
of Daphne Point. 
farther on. 
18 
156 
46 
46 
One-third mile off Meyden- 
23 
190 
464 
444 
Less than 4 mile NE. last 
bauer Bay. 
station, a 
• 19 
114 
46 
46 
Near middle of Meyden- 
23 
178 
464 
454 
Last deep sounding on 
liauer Bay. 
this line. 
19 
69 
46 
46 
South side of bay. (Other 
23 
72 
46 
46 
Near opposite shore from 
soundings taken in bay; 
Sand Point. 
same temperature.) 
23 
96 
46 
46 
About l,500feetfrom shore. 
19 
12 
47 1 
47 
Short distance south of 
23 
129 
46 
46 
About halfway from last 
Meydenbauer Bay. 
station to Kirkland. 
19 
40 
47 
47 
One-third mile farther 
south near shore. 
a Said to be thermal springs in near vicinity, which may account for the change of temperature. 
