West Bore Completed
Technical difficulties continued through the week slowing progress on the west bore under the Coquille River. On Friday the bore was finally completed and today the three conduits that will eventually carry the electrical transmission lines were pulled through the bore from the top of the hill on the south side of the river to the bore location on the north bank of the Coquille River. On Monday, the drilling rig will be repositioned to the east and construction of the east bore will begin.
During the week we prepared for the start of tidal channel excavation that will begin next week by intensifying fish salvage operations in the agricultural ditches that will receive the channel spoils. Due to the wet spring and other complications, there are coho salmon, coastal cutthroat trout and a variety of small non-game fish and salamanders in some of these ditches that connect with streams. We seined and set hoop net traps in these ditches to capture and relocate these fish and amphibians out of harm's way. We will continue to remove fish and amphibians as necessary until these ditches are filled.
Meanwhile, ecological monitoring proceeded this week with regular bird surveys, and measurements were taken on the Surface Elevation Tables (SET) installed last year by USGS. These devices are designed to detect millimeter scale changes in the elevation of the marsh surface, and will yield valuable information about the response of the marsh to sea-level rise, as well as short-term responses to restoration activities. We expect the sediment that will be carried in from the Coquille River on daily tides to settle in the marsh and gradually raise the surface elevation. We also have SET stations in the Bandon Marsh unit that will allow us to compare surface changes at Ni-les'tun restoration site with an undisturbed marsh.
Posted by the Oregon Coast National Wildlife Refuge Complex Staff at 8:05 PM in Category: Ni-les'tun Tidal Marsh Restoration Project