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In response to i~CTeasing concern about the quality of irrigation drainage and its potential effects on fish, w.ldhfe, and human health, the U.s. Department of the Interior formed an inte.rbureau task group to prepare a plan for investigating water-quality problems on irrigation projects sponsored by the Department of the Interior. The San Juan River area in northwestern New Mexico was one of L"e areas designated for study. . ln~estigators collected water, bottom-sediment, soil, and biological samples at more than 50 s.tes an the San Juan River area dunng 1993-94. Sample sites included (1) sites located within o..pa~ent ~f the (nterior irrigation project service areas, or areas that receive drainage from .rngation Prolects; (2) reference sites for comparison with irrigation project sites; and (3) sit"' " located within the reach of the San Juan River from Navajo Dam to 10 miles downstream from the dam: The types of habitat sampled included the main stem of the San Juan River, backwater areas adjacent to the San Juan River, tributaries to the San Juan River, ponds, seeps, irrigationdeli~ery canals, i~igation-drainage canals, a stock tank, and shallow ground water. The types of med.a. ~mpled ancluded ~ater, bottom sediment, soil, aquatic plants, aquatic invertebrates. amph.b.ans, and fish. Sem.permeabll'-membrane devices were used as a surrogate medium to sample both air and water in scme instances. Sample measurements included concentrations of major ions, trace elements, organochlorine pesticides, polychlOrinated biphenyls, polycyclicaromatic-hydrocarbon compounds, and stable isotopes of hydrogen and oxygen. This report presents tables of physical, chemical, and biological data collected for the U.s. Department of ~e Interio.r, "lation~1 ";igation Water-Quality Program. Additionally, supplemental phYSICal, chemICal, and b.ologacal data collected in association with the Navajo Indian Irrigatinn Projec+ are presented.

u.s. geological survey open file report/open-file report

Physical, chemical, and biological data for detailed study of irrigation drainage in the San Juan River area, New Mexico, 1993-94, with supplemental data, 1991-95