A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Dredging of Lewis and Clark Connecting Channel, Clatsop County, Oregon
Dredging of a navigation channel is proposed in the lower 4.50 miles of Lewis and Clark River, channel to be 10 feet deep, 150 feet wide in the lower 8,000 feet and 100 feet wide upstream with widening on bends and at juncture with existing channel in Youngs Bay; dredged material to be placed on 3 diked areas beside the river; maintenance dredging anticipated at 10-year intervals, one small reach of dike to be reinforced. Environmental impacts include improved navigation on lower Lewis and Clark River, disturbance of about 57 subaqueous acres and temporary turbidity of water caused by dredging; upstream intrusion of salt water with associated changes; deposition of 227,000 cubic yards of material on about 34.5 acres causing raising of ground level less than 5 feet and temporary elimination or displacement of vegetation and animal life. Adverse effects are a reduction in biologic productivity of aquatic and upland environments disturbed by dredging and disposal; possible changes in species distribution associated with the further upstream intrusion of salt water; and erosion hazard at disposal sites, and along banks.
Dredging of Lewis and Clark Connecting Channel, Clatsop County, Oregon
Dredging of a navigation channel is proposed in the lower 4.50 miles of Lewis and Clark River, channel to be 10 feet deep, 150 feet wide in the lower 8,000 feet and 100 feet wide upstream with widening on bends and at juncture with existing channel in Youngs Bay; dredged material to be placed on 3 diked areas beside the river; maintenance dredging anticipated at 10-year intervals, one small reach of dike to be reinforced. Environmental impacts include improved navigation on lower Lewis and Clark River, disturbance of about 57 subaqueous acres and temporary turbidity of water caused by dredging; upstream intrusion of salt water with associated changes; deposition of 227,000 cubic yards of material on about 34.5 acres causing raising of ground level less than 5 feet and temporary elimination or displacement of vegetation and animal life. Adverse effects are a reduction in biologic productivity of aquatic and upland environments disturbed by dredging and disposal; possible changes in species distribution associated with the further upstream intrusion of salt water; and erosion hazard at disposal sites, and along banks.
Dredging of Lewis and Clark Connecting Channel, Clatsop County, Oregon
1973
110 pages
Report
No indication
English
New dredging plant at Portland, Oregon
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