USACE CWMS - Pearl River Watershed

The Corps Water Management System (CWMS) includes four interrelated models to assist with water management for the basin:

- GeoHMS (Geospatial Hydrologic Modeling Extension)
- ResSIM (Reservoir System Simulation)
- RAS (River Analysis System)
- FIA (Flood Impact Analysis)

The Pearl River watershed originates at the confluence of the Nanawaya and Tallahaga Creeks in Neshoba County, Mississippi. Flowing southwest across Mississippi and Louisiana to a point near the Gulf of Mexico, where it enters the Rigolets via the West Pearl River and Lake Borgne via the East Pearl River. The Pearl River drains an area of some 8,760 square miles (22,700 square km) and has a length of 444 miles (715 km). The banks of the Pearl River are erosive causing active meandering of the river channel as bank caving and sediment deposits occur from each flow event.

The main stem of the Pearl River flows through one USACE Districts, Vicksburg District (MVK) in the Mississippi Valley Division (MVD). The Vicksburg District operates no reservoirs in the Pearl River watershed. There is one reservoir in the Pearl River Basin managed by the Pearl River Valley Water Supply District. The reservoir impounds 52 square miles in Rankin and Madison Counties, Mississippi and is used for water supply and recreation. Flood control is not an authorized purpose for this Project.

The Corps of Engineers owns three locks along the lower Pearl River Navigation Channel. This project was authorized by congress in 1939 and included the channelization of the West Pearl River, construction of 2 low head sills, a spillway, a 20 mile parallel canal and 3 navigation locks. The project was completed in 1957. . These include Pearl River Lock 1 and spillway (LA 00089) at River Mile 28.5, Bogue Chitto Sill and Pearl River Lock 2 (LA 00088) near River Mile 44, and Pools Bluff Sill and Pearl River Lock 3 (LA 00086) near River Mile 48.7

The Pearl River locks were placed in caretaker status in 1990 due to lack of use. In 2003 the project exceeded its 50 year project life and was considered for de-authorization. However, funding to initiate necessary studies was never approved.

美国陆军工程兵团水管理系统（Corps Water Management System，CWMS）包含四个相互关联的模型，用于辅助该流域的水管理工作：
- GeoHMS（地理空间水文模拟扩展工具，Geospatial Hydrologic Modeling Extension）
- ResSIM（水库系统模拟工具，Reservoir System Simulation）
- RAS（河流分析系统，River Analysis System）
- FIA（洪水影响分析工具，Flood Impact Analysis）

珍珠河流域发源于密西西比州内肖巴县纳纳瓦亚溪与塔拉哈加溪的汇流点，向西南流经密西西比州与路易斯安那州，最终抵达墨西哥湾附近区域：干流经西珍珠河注入里戈莱茨水道，经东珍珠河汇入博恩湖。该流域总面积约8760平方英里（22700平方千米），河道全长444英里（715千米）。珍珠河河岸抗侵蚀能力较弱，每一次径流事件都会引发岸坡坍塌与泥沙沉积，导致河道持续发生侧向摆动。

珍珠河干流流经密西西比河谷分区（Mississippi Valley Division，MVD）下辖的美国陆军工程兵团维克斯堡分区（Vicksburg District，MVK），但该分区并未在珍珠河流域内管理任何水库。珍珠河流域内仅存在一座由珍珠河谷供水管理区运营的水库，该水库位于密西西比州兰金县与麦迪逊县，蓄水面积达52平方英里，主要用于供水与休闲娱乐，其获批的功能并未包含防洪。

美国陆军工程兵团在珍珠河下游航道沿线共设有三座船闸。该工程于1939年获美国国会授权，建设内容包括西珍珠河河道渠化、2座低水头槛坝、1座溢洪道、1条20英里并行运河以及3座通航船闸，整体工程于1957年竣工。具体设施如下：位于河程28.5英里处的珍珠河1号船闸及溢洪道（LA 00089）、靠近河程44英里处的博吉奇托槛坝与珍珠河2号船闸（LA 00088），以及靠近河程48.7英里处的普尔布拉夫槛坝与珍珠河3号船闸（LA 00086）。

1990年，由于使用需求极低，珍珠河沿线的三座船闸被置于维护代管状态。2003年，该工程已超出其50年设计使用年限，随即被纳入撤权考量范围，但后续启动必要研究的相关拨款始终未获批准。