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It depends on the river, but natural seasons dictate river navigation:
Water Levels: Rivers rely on rain and mountain runoff. High water can sometimes prevent boats from passing under low bridges, while low water can prevent navigation in shallower sections. Lock Maintenance: Many rivers close entirely at specific times of the year for scheduled infrastructure repairs (for example, the Douro closes from mid-December to early March). Our Advice: We list clear sailing seasons for each destination (usually Spring and Autumn) and give you honest updates on water conditions before you book.