<p>In the 2003 year was development the out river Iglesias In the municipality of Sogamoso (Boyacá) in the gulch, a study on the composition of the community of macroinvertebrates. Two stations were selected to several altitude, between the 3000 y 3200 [m.s.n.m] and was make measuring of the physic-chemical conditions like dissolved oxygen and [pH]. This first surrender present the determination of larvae and nymphs of the three order representative the we indication the state of the ecosystem. In the Trichoptera order the opposing genders were Helycopsiche, Brachysedotes, Triplectides, Atanotolica, Nectopsyche, Smicridea and Leptonema, in the Ephemeroptera group the reported genders are Bateis, Tricorytodes, Leptohyphes and Traulodes.</p>