7276

• UCREFRP Catalog Number: 7276
• Author: Platania, S. P. and K. R. Bestgen.
• Title: Study of the Rare and Endangered Fishes of the San Juan River, New Mexico
• USFW Year: 1988.
• USFW - Doc Type: 1988 Report of Activity.
• Copyright Material: NO

STUDY AREA
During March and April 1988, we concentrated our surveys in
the San Juan River offew Mexico from the geologic formation
known as the "Hogback' downstream to the U.S. Highway 160 bridge
at the Colorado-New Micico border, a river reach of about 68 km
(42 miles) (Figure 1)- On the July and October 1988 trips, we
focused our efforts oe.a 48 km (30 miles) reach between Shiprock
and the Colorado-New *xico border (Figure 1). A detailed
description of the stzly area can be found in our 1987 San Juan
River, New Mexico, report (Platania and Bestgen 1988).
Table 1. Discharge* 03/s) of the San Juan River at Farmington,
Shiprock, aid Four Corners during the three 1987 and
four 1988 s$veys of the San Juan River, New Mexico.
Date Farmington Shiprock Four Corners
* 20 March 1988 26.4 26.5 31.6
4 May 1987 183.2 219.4 240.5
* 28 April 1988 28.3 28.3 49.0
5 August 1987 52.5 42.4 42.5
* 28 July 1988 17.3 17.6 16.7
4 October 1987 30.9 29.3 27.8
* 23 October 1988 18.6 18.9 28.2
* Provisional values p=vided by U.S. Geological Survey
Discharge during aach of our 1988 survey trips was
considerably lower tha those of the previous year (Table 1).
For example, the discharge during May 1987 was 6.5 times greater
than in late April 198F, while October 1988 flows were only 1.6
3