USACE CWMS - Little 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)

Little River rises in the mountainous country of Le Flore County in southeast Oklahoma and is about 217 miles long. It flows in a westerly direction from its source through Le Flore and Pushmataha Counties, Oklahoma, to the McCurtain County line, thence easterly through McCurtain County, Oklahoma, and Sevier County, Arkansas, to a point near Horatio, Arkansas, then it turns southeast to join the Red River near Fulton, Arkansas. The drainage basin is fan-shaped, with a total area of about 4,260 square miles. Five large tributaries join Little River from the north. They are: Glover Creek, drainage area 338 square miles, entering 127.9 miles above the mouth; Mountain Fork River (Broken Bow Lake), drainage area 842 square miles, entering 87.1 miles above the mouth; Rolling Fork River (DeQueen Lake), drainage area 354 square miles, entering 72.9 miles above the mouth; Cossatot River (Gillham Lake), drainage area 530 square miles, entering 43.5 miles above the mouth; and the Saline River (Dierks Lake), drainage area 552 square miles, entering 22.8 miles above themouth. These streams are left bank tributaries, Each of these tributaries and the head waters of Little River flow out of the mountainous area in southeast Oklahoma and southwest Arkansas to the main Little River bottoms, paralleling the Red River in southern Oklahoma and southwestern Arkansas. Nearly 75 percent of the total drainage area is mountainous country covered with a heavy growth of timber. The remaining 25 percent of the drainage area is timbered overflow area and rolling hill country. The elevation of the headwaters of Little River and its tributaries is in excess of 1,000 feet msl. The elevation of the land at the mouth of Little River near Fulton, Arkansas, is about 235 feet msl. There is considerable overflow area on Little River and in the lower reach of each of the five main tributaries. The channel slope varies

Corps 水资源管理系统（CWMS）集成了四个相互关联的模型，旨在协助流域的水资源管理，包括以下模型：
- GeoHMS（地理水文建模扩展）
- ResSIM（水库系统模拟）
- RAS（河流分析系统）
- FIA（洪水影响分析）
小河发源于东南俄克拉荷马州洛弗尔县的山地地区，全长约217英里。河流自源头向西流经洛弗尔县和普什马塔哈县，直至麦克库伦县边界，然后向东流经麦克库伦县、阿肯色州的塞维厄县，最终在阿肯色州霍拉肖附近转向东南，汇入阿肯色州富尔顿附近的红河。流域呈扇形，总面积约为4,260平方英里。五条主要支流自北方向小河汇入。它们分别是：格洛弗溪（排水面积为338平方英里，入口处距河口127.9英里）；山溪河（布罗肯鲍湖），排水面积为842平方英里，入口处距河口87.1英里；滚河（迪昆湖），排水面积为354平方英里，入口处距河口72.9英里；科萨托特河（吉尔哈姆湖），排水面积为530平方英里，入口处距河口43.5英里；以及盐河（迪尔斯湖），排水面积为552平方英里，入口处距河口22.8英里。这些河流均为左岸支流，每一条支流以及小河的源头均自东南俄克拉荷马州和西南阿肯色州的山地流出，汇入小河的主干底部，与南部俄克拉荷马州和西南阿肯色州的红河平行。总面积的近75％为被茂密森林覆盖的山地国家。剩余的25％为森林覆盖的泛滥区和平缓的山丘地带。小河及其支流的源头海拔超过1,000英尺（海平面以上）。小河在阿肯色州富尔顿附近的河口处海拔约为235英尺（海平面以上）。小河及其五条主要支流的下游均存在相当面积的泛滥区。河道的坡度各异。