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• relating water-quality characteristics to streamflow or indicator <br />water-quality variables are described in detail in Sections 2.2 <br />and 2.3, respectively. <br />2.1.1 streamflow, streamflow data for the study area were <br />available at 13 nodes in the Trout Creek hydrologic system and at <br />one node on the Yampa River (Figure 2). Due to the data-record <br />gaps and/or lack of data at some of the upstream node points, <br />several forms of data-fill-in procedures were considered and three <br />upstream flow records in the Yampa River basin were used (Table <br />1). Available streamflow data are discussed in this section, and <br />the methods of streamflow data fill-in are given in Section 2.2. <br />The available streamflow records are summarized in Table 1. Com- <br />monly, streamflow records were missing in early years of the his- <br />torical (1976 through 1983 water years) period before gaging sta- <br />tions were operational and in winter months when gaging stations <br />would freeze up and/or recorders were not in operation. As an <br />• extreme, as little as 7 percent of the 8-year (96-month) record <br />was available at one station. One record out of 14 nodes was <br />complete, and, on the average, records were slightly more than <br />half (53 percent) complete. However, at other stream nodes other <br />than the 14 gaging stations designated above and in Table 1, <br />entire monthly streamflow data sets had to be estimated, for pur- <br />poses of upstream node controls or sites where water-quality data <br />but no streamflow records were available. In all, calibration <br />data on streamflows and water-quality were considered at 21 nodes <br />in the Trout Creek system and at 1 node on the Yampa River <br />upstream and 2 nodes downstream of the confluence with Trout <br />Creek. <br />2.1.2 Water Quality. Historical water-quality data for the <br />period of the 1976 through 1983 water years were considered for <br />the modeling calibration analysis. Model nodes with water-quality <br />data available are indicated on Figure 2. The types of available <br />• water-quality data are summarized in Table 2 and are categorized <br />by source as follows: <br />-4- <br />