PA Aquatic Resource Restoration Conference 2026: Past, Present and Future

Dynamic alluvial valley restoration approaches have been implemented in multiple catchments at Robinson Fork in western Pennsylvania, with some sites now reaching 10 years or more post-restoration. As with many process-based restoration efforts, the aim is to establish a system that can evolve and change over time while maintaining desirable functions, such as reduced erosion, improved water storage, nutrient retention, and increased habitat heterogeneity. To better understand how restored dynamic alluvial valleys perform over time, we monitored hydrological and biological processes in six sections of restored alluvial valleys and four unrestored valleys over 4-5 water years. Restored sites included a range of valley size and habitat types, from small valleys with anastomosing channels through wet meadow habitat, to larger valleys with perennial, hard-bottomed channels, and lateral side channels. The unrestored sites were single thread, incised channels with low floodplain connectivity. We will discuss seasonal patterns in water depth and wet/dry cycles measured using HOBO water depth monitors, trail cameras, wet/dry (STIC) sensors, and soil moisture. Restored and unrestored sites differed in nutrient retention, based on quarterly water and stream sediment samples. Allochthonous inputs were lower at restored sites which had shorter woody vegetation than unrestored sites with mature forest canopy. However, leaf-litter breakdown rates were similar even though the composition of macroinvertebrate communities varied with channel type, seasonal flow variability, catchment size, and restoration status. Our results reinforce the importance of site-specific features and multiple assessment approaches to evaluate the performance of restored systems at different spatial and temporal scales.