weir, dam, forebay, hatchery, headrace, cofferdam, millrace, alewives, sluiceway, penobscot river, revetment, outfall, inlet, culvert, groyne, shoaling, bascule bridge, flowage, lockmaster, jetties, tailrace, watercourse, spillway, elver, steelhead, trestle bridge, marina, shoreline, breakwater, smolt, riprap, oxbow, gillnet, sandbars, streambed, pier, estuary, gabion, flume, dredging, wharf, landlocked salmon, truss bridge, causeway, cohos, cove, slipway, bailey bridge, exclosure, graving dock, chinook salmon, pontoon, cape cod canal, waterline, gabions, salmon, millpond, cartway, lungfish, coho salmon, bascule, purse seining, murrumbidgee river, lagoon, intertie, creek, welland canal, habitat, menai strait, fishery, tideland, drawbridge, wetlands, sockeye, estero, penstock, gill net, eelgrass, retaining wall, diking, falsework, canal, mudflat, emerald shiner, bulkhead, barbless, gobies, pilings, splake, boardwalk, river, brook trout, chinook, overcrossing, ponds, conservancy, navigational system, lamprey, piping plover, seawall, dock, reservior, abutments, anchors, baffles, breakwaters, divider, handrail, handrails, headstone, hoist, hoists, louvers, lugs, pump, raceway, railings, shoring, sluices, spacers, truss