58 
BULLETIN OF THE UNITED STATES FISH COMMISSION 
Obsidian Creek with Winter Creek will, apparently, be one of the best of trout streams. 
Its temperature is about 50°. Its bottom of lava gravel is lined with grass, alg®, and 
water plants in which small Crustacea swarm. 
Indian Greek is a clear, cold stream, similar to the Gardiner, and like it, heading 
in the east . slope of the Gallatin Mountains. 
Olen Greek, or West Fork of the Gardiner, rises in Sepulchre Mountain and flows 
southeast, then northeast, joining the Gardiner at the foot of its canon. 
This is a small stream, which runs mostly through open meadows. It is 5 or 6 feet 
wide and 1 to 2 feet deep, with gravelly and grassy bottom. Its waters are very cold 
(about 48°) and full of crustacean life. The red-bellied frog, Bana septentrionalis, is 
abundant. Glen Creek has a high waterfall, some 70 feet high (Rustic Falls), at the 
‘‘Golden Gate,” near the base of Bunsen’s Peak (see plate VIII). 
Below the fall the deep cailon is so choked up with boulders and talus that fish 
can not ascend it. Above the fall Glen Creek receives a considerable tributary, which 
drains Swan Lake. Swan Lake is a small roundish pond, about half a mile long, with a 
bottom of crumbled lava. While its shores are very shallow, the depth in the center 
seems considerable. The waters are clear and cold, abounding in insects and Crus- 
tacea. In Glen Creek and the Gardiner River 5,000 Brook trout, Salvelmus fontinalis, 
were placed in August of this year. 
The lower course of the Gardiner, below the three falls (vJsprey, Undine, aud 
Rustic), is well stocked with trout and contains whiteflsh {Goregomts williamsoni), 
suckers {Gatostomus griseus), and minnows {Bhinichthys duleis). Below Mammoth 
Hot Springs it receives the scalding Hot River, the drainage of the springs. That 
these hot calcareous and sulphuretted waters are not destructive to fish life, even to 
that of trout, has been already shown. It is said that in winter the trout are espe- 
cially abundant about the mouth of this stream. 
MISSOURI DRAINAGE (730 square miles). 
The three streams which unite near Gallatin City, Mont., to form the Missouri 
are the Jefferson, the Madison, and the Gallatin Rivers. Of these, the Jefferson lies 
outside the Park. The Gallatin and two little-known tributaries (Fan Creek and 
Grayling Creek) rise in the wild region west of the Gallatin Mountains in the north- 
west corner of the Park. These cold, clear streams, rarely visited by sportsmen, are 
said to be well stocked with trout and grayling. 
Madison Biver drains an area of 730 square miles in the Park; this includes the 
country to the west of the Yellowstone and to the north of the Continental Divide. 
The name Madison is only used for the river below the junction of its chief tributaries, 
the Firehole River and the Gibbon River. 
Gibbon Biver, the smaller of the two streams, rises north of the center of the Park 
in the hills and marshes around Grebe Lake, a body of water not far from Crystal Lake, 
on Cascade Creek. Grebe Lake, about a mile long, surrounded by mountain meadows, 
is said (by Mr. Hague) to be one of the finest lakes in the Park. In the outlet of the 
lake above the falls known as Virginia Cascades, 1,000 rainbow trout {Sahno irideus) 
have been lately planted. The region about the upper course of tli£ Gibbon is heavily 
timbered and its basin is separated by low divides from that of Obsidian Creek. Not- 
withstanding the influx of many hot springs, solfataras, soda springs, and even iron 
springs, the Gibbon remains a clear, cold riv'er (55°) throughout its course. The Vir- 
