 The majority of Scarborough Marsh, Maine's largest saltwater marsh complex, has been negatively impacted by man-made ditches, which have been used to drain the marsh, lowering the natural water table and reducing the number of permanent pools on the high marsh.Since early 2000, with the creation of the Friends of Scarborough Marsh, hundreds of acres of open water habitat have been restored by plugging existing ditches and re-creating pools.The new permanent pools on the high marsh again became home for cordgrass, aquatic invertebrates, mosquito-eating saltmarsh fish and waterbirds including black ducks and glossy ibis.