The Ontario Stream Assessment Protocol (OSAP) contains a series of standardized methodologies for identifying sites, evaluating benthic macroinvertebrates, fish communities, physical habitat and water temperatures in wadeable streams. The OSAP provides standardized methods that ensure data repeatability. Use of these standard methodologies allow data to be shared, used for multiple purposes and stored in a common database. Download a PDF copy of the OSAP Manual Version 10, updated April 2017, from Toronto and Region Conservation.
The OSAP Compendium Manual: Guidelines for Designing and Interpreting Stream Surveys in Ontario (Ver. 1.1. 2003) is also available for download. The materials provided in this manual are intended to compliment the procedures described in the Ontario Stream Assessment Protocol by providing advice on study design and interpretation of results.