338 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



and again on July 26, about 6 miles east ot .Newcastle. At the first 

 place we found it to be a clear, cold, swift creek about 7 feet wide, 14 

 feet deep, with a 4-foot current, and a temperature at 10 a. m. of 43°, 

 when the air was 51°. The bottom was of large gravel in most places, 

 mud-coated rocks with much Chara, and other aquatic vegetation in 

 other places where the water was less swift. The banks were usually 

 of mud, 1 to 5 feet high, and were covered with a good growth of wil- 

 lows, box-elders, buffalo berry, and cottonwood. The hills near by were 

 covered with pines. No fish were seen here. At the place where it 

 was visited July 20 it was about 10 feet wide and 2 feet deep, with a 

 current flowing 2h feet per second. The temperature of the water at 

 this time was 58°, while that in some of the springs was 54°. One set 

 of springs on Mr. Hanson's ranch near by discharges about 700 gallons 

 per minute, while another furnishes about 300 gallons per minute. 



We saw a number of fine brook trout and rainbow trout in the irri- 

 gating ditches on Mr. Hanson's ranch. These all seemed to be doing 

 well, but Mr. Hanson did not think that they increased in numbers very 

 rapidly. The water wns thoroughly saturated with gypsum. From tlie 

 brook we took one species of sacker and two species of minnows. 



Salt Greeli is a very small western tributary of Beaver Creek. We 

 saw it east of Newcastle, Wyo., where it contained very little running 

 water and no fish. The water was strongly saturated with common 

 salt. On October 20, this creek was about 7 feet wide, 3 inches deep, 

 and flowed about 9 inches per second. The temperature was 45° at 11 

 a. m., when the air was 52°. 



Beaver Creel: — At Buffalo Gap, a small station on the Elkhorn Road 

 east of Hot Springs, we examined a little stream called Beaver Creek. 

 In places it was 10 feet wide and 3 feet deep, while at others it was 

 narrowed down to a small, shallow ripple. The water contained much 

 vegetation, principally alga- and Chara. The latter was iucrusted with 

 calcareous deposits from the water. We found suckers very abundant 

 and took two species (Pantosteus jordani and Catostomus commersonii), 

 besides three species of minnows and one species of catfish (JFoturus 

 flavus). 



French Greeli is a small stream which rises in the central part of the 

 Black Hills and flows east to the south fork of the Cheyenne. We 

 examined it at Custer, S. Dak. There is no creek worth mentioning, 

 and at the time of our visit it consisted of a few stagnant pools. We 

 took Semotilus atromaculatus, Bhinichthys cataractce duleis, Pimeph<i!<;< 

 promelas, Pantosteus jordani, and Catostomns commersonii, all thickly 

 covered with trematodes. Some of the fish were about dead from the 

 effects of these parasites. Near Custer there is an interesting artificial 

 lake, but it contained no fish. 



Spring Creel', a western tributary of the Cheyenne, was examined at 

 Hill City, S. Dak. It was not over 10 feet wide and contained very 

 little running water. From it we took Pantosteus jordani, Catostomns 

 commersonii, Bhinichthys cataractce dulcis, and Semotilus atromaculatus. 



