Brett Nelson, with Alaska Department of Transportation & Public Facilities (DOT&PF), states the project purpose is to construct a new riprap dike, berms, and armored banks with riprap to channel the Delta River back to its original location in order to protect Spengler Road and nearby residences from further flooding and erosion related damage. Pursuing this work with immediacy is important because the longer the river stays in its new channel the harder it becomes to repair Spengler Road properties and other DOT&PF infrastructure (i.e. the Richardson Highway). Work being purposed includes to construct a new riprap dike and berms and armor the banks with riprap to direct the Delta River back to its original channel, and away from Spengler Road. The dike would be armored with Class-II riprap with 5-feet (ft) keyway and would be 8-ft high with a 3:1 slope on the river side. The dike and berms would be constructed of gravel and riprap that would result in approximately 7,000 cubic yards of fill below ordinary high water (OHW). The dike would be approximately 150-ft long and 53-ft wide at the base be constructed of Class-II and Class-III riprap. The armored bank/berms would be approximately 1,700-ft long and 23-ft wide at the base and built of gravel borrow and armored with Class-II riprap. Total area of impact below OHW would be 1.2 acres, 0.2 acre for the dike and 1 acre for the berms. All work would be performed in accordance with the enclosed plan (sheets 1-3), dated July and August 2020. The project site is located within Section 17, T. 09S., R. 10 E., Big Delta A-4; Latitude 64.1322º N., Longitude -145.8339º W.; Spengler Road, approximately from Milepost 5.3 to 5.8. Please contact John Sargent at (907) 458-1603 or by email at: John.C.Sargent@usace.army.mil if further information is desired concerning this notice.
POA-2020-00357, Delta River_PN