1 -REPORT OF EXPI.ORATIONS IN COLORADO AND UTAH DURING THE SUM- 
MER OF 1889, WITH AN ACCOUNT OF THE FISHES FOUND 
IN EACH OF THE RIVER BASINS EXAMINED. 
BY DAVID STARR JORDAN. 
[Plates I to V.] 
INTRODUCTION. 
cruder the instruction of the LT. S. Commissioner of Fish and Fisheries, Hon. Mar- 
shall McDonald, the writer undertook to make a series of examinations of the different 
streams of Colorado and Utah. This examination had two general purposes : First, to 
ascertain the general character of the streams of the Eocky Mountains and the Great 
Basin, their present stock of food -fishes, and their suitability for the introduction of 
species not now found there; second, to catalogue the fishes native to each stream, 
whether food-fishes or not, in order to increase our knowledge of the geographical dis- 
tribution of each species and to throw further light on the laws which govern geograph- 
ical distribution. 
In the present paper is given an account of each stream, a list of the fishes found in 
it, and such notes, geographical or economic, as add to our knowledge of it. 
In the work of the summer the writer had the very efficient help of his students. 
Prof. Barton W. Evermann of the Indiana State Normal School at Terre Haute, Mr. 
Bert Fesler of Topeka, Kans., and Mr. Bradley M. Davis of Chicago, 111. The prose- 
cution of the work was also materially aided by the help given by Mr. Eichard Eathbun, 
assistant in charge of the work of scientific inquiry in the U. S. Fish Commission. We 
were also much indebted to several citizens of the regions visited for the interest they 
showed in our work and the help rendered by them. Of these we may mention es- 
pecially Mr. George E. Fisher of Leadville, Hon. Gordon Laud, fish commissioner of 
Colorado, Mr. Peter Madsen of Provo, Utah, and Mr. .1. F. Brown of Blake City, Utah. 
Efficient help was also rendered by Col. John Gay, assistant to the U. S. Fish Com- 
mission, then in charge of the erection of the fish hatchery at Evergreen Lake, near 
Leadville. 
The streams examined may be grouped as follows : 
A. — Platte River : 
South Platte River, at Hartsel’s Hot Springs, in the South Park. 
South Platte River, at Denver. 
Bear Creek, at Morrison. 
Boulder Creek, above Boulder. 
Bull. U. S. F. C. 89 1 
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