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stream flow. These responses. to stream flow by different user groups ~~ are the criteria which are basic to the methods introduced here. The first method is called the single cross section approach. This method is useful primarily for identifying flows below which a recrea- tion activity is not 'feasible and results in a so called "minimum" flow recommendation. The second method is called the incremental method. With this method the recreation planner is able to analyze various flows and determine the recreation potential of a stream at different flows. This paper is being distributed with four objectives in mind. These are: 1. To bring the problem of preserving instream flows to the attention of recreation agencies and the research community in order to encourage more research in this vital and neglected area. 2. To discuss the development of the recreation probability-of- use curves and of recreation criteria in general, which are necessary for quantifying instream water requirements for recreation. 3. To obtain review and comment on the recreation criteria and probability-of-use curves, and to request data which may be used to test or improve the criteria or curves. 4. To describe the two approaches for assessing stream flows and 'discuss how various recreation planning processes can be served by their application. Both methods of instream flaw analysis discussed in this paper utilize computer modeling techniques. Both approaches also require that streamflow data be collected. The single cross section approach, as its name implies, requires that information be collected at only one loca- tion on the stream. The incremental method requires that data be col- lected at multiple locations on the stream. In addition to cross sectional data, ..data relating the streamflow parameters to recreation potential are necessary. These data are termed recreation criteria. Recreation criteria for instream flow methodologies are the rec- reation activity information bases necessary to describe a relationship between the quantity of water flowing in a stream, and the quantity and 2