Significant land slides occurred in 1983/84 in the upper reaches of the Chimacum Ck headwaters in the Eaglemount region following heavy rainfalls with water runoff flowing along logging roads and skid trails. Approximately 15,000 yards of sandy gravel sloughed from the hillsides above the stream and slid across its historic channel displacing its course by several hundred feet to the north. The slide area is a significant source of heavy sediment with fine particles that are deposited into the stream system filling the channel in the farmlands below. It came loose again in 1997 and Pope Resources did perch landing and road abandonment work in late '90's that reduced surface runoff flows towards the slide areas. The slopes have become more stabilized due to vegetation—natural recruitment and through planting efforts, however, steep slopes are still a concern. The slide area is currently covered heavily in alder.

The instream sediment basin was constructed in 1986 to capture sediment and prevent downstream water quality problems associated with sediment loading. It was constructed at the head of the valley by NRCS, WDFW, Jefferson County Conservation District, Pope Resources and local farmers. Periodically the sediment that has collected in the basin is cleaned out with an excavator. The Jefferson County Conservation District has taken the lead on getting the basin cleaned out, which has occurred at least four times as of January 2010. The basin continues to function as designed. In addition to protecting Chimacum Creek's downstream channel, trees planted around the basin have matured and the relatively deep and cool water provides a functional salmonid rearing pond.

See HWS # 02-05-003, Eaglemount Sediment Basin Plantings, for more information about the riparian restoration effort in this reach.