The Stillaguamish Tribe of Indians used this funding to isolate the North Fork of the Stillaguamish River from the Steelhead Haven landslide and eliminate it as a significant source of fine sediment input. This was accomplished by constructing a large crib-wall structure at the toe of the landslide and by building a large sediment retention pond to store fine sediment before it entered the river through a series of gravel berms. One of the primary factors limiting Chinook production in the Stillaguamish watershed is fine sediment input before and during spawning and incubation. As stated by the Washington Department of Fisheries in the 1970's, "The principal factor limiting salmon production within the North Fork is sedimentation resulting from a major clay slide. Below that point, heavy silt deposits cover most of the gravel riffles, making them unsuitable for successful spawning and egg incubation. This condition also inhibits natural cycles of aquatic insect growth, reducing food production, and consequently lowering the holding and rearing capacity of the stream below." Sediment from the slide filled pools and made the overall channel network shallower and wider, which resulted in increased temperature from reduced shading and groundwater interception. Improving habitat and water quality required that the sediment source was reduced and that channel storage was increased. A feasibility report for the project had been completed previously (#99-1687N). Turbidimeter measurements were made before and after construction above and below the project site. The meters recorded 24/7 throughout the project and beyond. Reducing sediment to a level the river can flush will be the measure of the project’s effectiveness, along with increased spawning and survival. Surveys of spawning Chinook after construction downstream of the landslide treatment showed more fish use than had been seen in the prior three decades.