Intermittent rivers and ephemeral streams (IRES) are characterized by loss of flow and dry conditions during parts of the year. Despite comprising over 50% of the world’s river systems, IRES are relatively understudied compared to their perennially flowing counterparts. While many theoretical models of large river systems emphasize the role of terrestrial subsidies in supporting aquatic food webs, similar approaches remain underutilized in IRES systems. We seek to evaluate the relative importance of aquatic-terrestrial linkages in IRES systems using bulk stable isotope analysis of C, N, and H. We expect to find strong influence of aquatic sources in terrestrial consumer diets during high-flow seasons, and attenuation of linkages during dry seasons. We also anticipate that IRES will rely more on allochthonous inputs than perennial streams, due to the loss of autochthonous production during flow cessation. Twelve drought-prone streams in the north Texas area were sampled across four seasons. These sites all occur within rotationally grazed rangelands and capture a gradient of flow intermittency from a fully terrestrial site to a perennially flowing stream. Over 3000 samples of aquatic and terrestrial sources (C3 and C4 plants, algae, and macrophytes) and consumers (benthic macroinvertebrates, fish, terrestrial invertebrates) were collected and isotopically analyzed. The proportion of consumer diets derived from aquatic and terrestrial basal sources were determined using isotopic mixing models. Additionally, variables related to water availability and quality were used as predictor variables in mixed effect models to assess which aquatic habitat parameters are most impactful for determining consumer diets.