Indicator: Oyster Reefs Restored in Chesapeake Bay Tributaries (2016-2025)

Data are collected on oyster reef restoration in 11 tributaries—Harris Creek, Little Choptank, Tred Avon, and the upper St. Mary’s and Manokin rivers in Maryland; Piankatank, Lafayette, Lynnhaven, Great Wicomico, lower York, and the Eastern Branch of the Elizabeth rivers in Virginia. Partners track progress by tallying acres of reefs that have undergone restoration treatment to meet Executive Order 13508 and Chesapeake Bay Watershed Agreement outcomes, were restored prior to those agreements, or are naturally occurring reefs already meeting oyster density criteria; these categories are summed and reported as “completed acreage” for each tributary. Partners document progress in annual reports approved by the Maryland and Virginia Oyster Restoration Interagency Teams, and the NOAA Chesapeake Bay Office maintains these data. Note: This Indicator supported progress tracking toward the Oysters Outcome in the original Chesapeake Bay Watershed Agreement, adopted in 2014. The Watershed Agreement and Oysters Outcome were revised in 2025. Access the Indicator Materials: - Analysis & Methods - Data File - Map Service本数据集收集了11条支流的牡蛎礁修复相关数据，覆盖范围包括马里兰州的哈里斯溪（Harris Creek）、小乔普坦克河（Little Choptank）、特雷德阿文河（Tred Avon）、圣玛丽河上游（upper St. Mary’s）与马诺金河（Manokin River），以及弗吉尼亚州的皮安卡坦克河（Piankatank）、拉斐特河（Lafayette）、林恩黑文河（Lynnhaven）、大威科米科河（Great Wicomico）、约克河下游（lower York）与伊丽莎白河东支流（Eastern Branch of the Elizabeth rivers）。 合作方通过统计三类牡蛎礁的面积追踪修复进展：符合《第13508号行政命令》及《切萨皮克湾流域协议》目标的修复后礁、上述协议生效前完成修复的礁，以及已满足牡蛎密度标准的自然礁；上述三类礁的总面积将被汇总，并以各支流的"完成修复面积（completed acreage）"形式上报。 合作方会在经马里兰州与弗吉尼亚州牡蛎修复跨部门小组批准的年度报告中记录修复进展，相关数据由美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration，NOAA）切萨皮克湾办公室负责维护。 注：本指标用于支撑2014年通过的原版《切萨皮克湾流域协议》中"牡蛎成果（Oysters Outcome）"目标的进展追踪。该流域协议及"牡蛎成果"已于2025年完成修订。可获取以下指标材料： - 分析与方法（Analysis & Methods） - 数据文件（Data File） - 地图服务（Map Service）