bridge over safety spillway of the dam. stone bridge with natural paving of gray flat stones. on the edge of the retaining walls i

architecture banister barrier black bridge canal cliff color dam dirt ditch dock edge embankment expensive fish flat flood flow flows forged gravel gray history installation iron irregular lake landscaping lawn meadow metal mirror natural over overflow paving pond pool protection railing reflection reservoir retaining river riverside road rough row safety sluice spillway stone stones subtle through wall walls water waterfall waterfront waterway wrought