Description - Ouachita-Black Rivers System in AR and LA has four locks and dams. There are boat ramps and picnicking facilities on the river. The Felsenthal National Wildlife Refuge is located along the river near the AR and LA border.
- The Ouachita River originates in Polk County, Arkansas, and flows 510 miles in a southerly direction to Jonesville, Louisiana, where it converges with the Tensas and Little Rivers to form the Black River. Black River meets the Red River (J. Bennett Johnston Waterway) 41 miles south of Jonesville. About 28½ miles below the mouth of the Black River, The Red River comes to a junction with the Atchafalaya River and the western end of the seven mile long Old River, which historically linked these rivers to the Mississippi River.
The Ouachita-Black Rivers Navigation Project was began in 1902 and is a 337-mile long waterway. The project stretches from central Arkansas to Jonesville, Louisiana where it converges with the Tensas and Little Rivers to form the Black River.
Recreation - There are eight recreation area along the Columbia Pool. Camping is available in two of the areas and boat ramps exist at seven of the eight. Picnic sites are available and there are playground at three sites. Swimming is available at a beach at the Sterling Recreation Area.
Climate - Southern Louisiana experiences a subtropical climate that's warm throughout the year. Winter months bring low temperatures near 40 degrees F and highs above 55 degrees F. During the summer expect high temperatures to reach 95 degrees F frequently, with mid-afternoon showers. Humidity is highest in August and September. Northern regions of the state have cooler winters and somewhat warmer summers than the south. Low temperatures in the winter dip into the high 30s and highs reach 60 degrees F. July and August are the hottest months with average high temperatures reaching 100 degrees. Humidity is slightly lower in the northern uplands and the average rainfall in May is higher than any other month.
The Ouachita-Black River system is located in southern Arkansas and northern to central Louisiana. The navigation project stretches from Camden, Arkansas to Argo, Louisiana.