232 
BULLETIN OF THE UNITED STATED FISH COMMISSION. 
little of the lagoon bares at ordinary low water. The water is brackish and slightly 
warmer than the bay; no temperature observations, however, were made. Many 
humpbacks and a few dog salmon were seen schooling just inside the entrance, while 
Dolly Varden trout of large size, starry flounders, and sculpins were seen in great 
numbers. A few humpbacks were spawning in the lower part of the lagoon and in 
the slough on the northern side. 
A mile from the northeastern -end of the lagoon, at the head of the valley, is a 
deep fresh-water lake. This is an irregular basin about 1£ miles in greatest length by 
less than half a mile average width, the major axis lying northwest by north and 
southeast by east (magnetic). It is surrounded by hills on all sides except at the 
valley through which it drains. It was not practicable to examine the lake at this 
time. No entering streams Avere to be seen from the outlet, though three or four 
valleys in the distance probably carry small feeders, where there are doubtless good 
spawning-beds. It is not doubted that there is a suitable location for a hatchery 
somewhere on this lake, as the indications point to a good supply of water by gravity 
from the surrounding hills. The lake is drained by a shallow stream which follows 
a winding course for II miles through the valley and enters the head of the lagoon. 
The floor of the valley is undulating, covered ivith grasses, moss, wild flowers, and 
scrub in its greater part, Avith some fair-sized alders, willows, and spruce trees on 
the northern side. The stream flows Avith a velocity of about II to 2 knots an hour 
above the rapids near the lagoon, where it is about 30 feet wide by 8 inches average 
depth. Above' the cascade, in the upper part, the stream is broad Avith line gravel 
\ 
Free-hand sketch of Horse Marine lagoon, stream, and lake, Olga Bay. 
