Chipola River

The Chipola River's headwaters are in Houston County, Alabama. The river is formed by the junction of Marshall Creek and Cowarts Creek in northern Jackson County, Florida. The river passes through Florida Caverns State Park near Marianna, where it briefly becomes an underground river, and continues southward over the Dougherty Karst Plain through Jackson County and northernmost Calhoun County, and over the Apalachicola Delta through the balance of Calhoun County and the northern half of Gulf County before joining the Apalachicola River. The Chipola River at its source is above sea level, and falls to above sea level at its juncture with the Apalachicola River. It varies from to deep, and from to more than wide. The watershed for the river covers about . The Chipola River is the largest tributary of the Apalachicola River below the junction of the Chattahoochee and Flint rivers, with its drainage basin of above where the Chipola Cutoff joins the Chipola River accounting for half of the Apalachicola's drainage basin below that junction. The flow of the Chipola River at the lower end of Dead Lake in 1979/1980 ranged from per second in late autumn to per second at peak Spring floods, for an annual mean flow of per second. Tributaries of the Chipola River, in addition to Marshall Creek and Cowarts Creek, include Waddells Mill Creek, Merritts Mill Pond, Dry Creek, Rocky Creek, Mill Creek, Fourmile Creek, Juniper Creek, and the Chipola Cutoff. The river is fed by more than 60 springs, including the 1st magnitude Jackson Blue Spring and several 2nd magnitude springs. ==Dead Lakes==

An , , natural impoundment of the Chipola River near Wewahitchka in southern Calhoun County and northern Gulf County is known as Dead Lake or Dead Lakes. The lake has been described as a cypress swamp. Dead cypress stumps and snags fill the lake, hindering navigation by motor boats. The lake has a good reputation for fishing for redear sunfish (shellcrakers) and bluegill (bream), especially in the spring. In the later 19th century and into the 20th century the area around the Dead Lakes attracted sports hunters and fishermen, who could travel there by steamboat on the Apalachicola River, landing at an old railroad wharf at the town of Iola, where hotels, boarding houses and fishing and hunting clubs were available. Levee Dead Lake is impounded by a levee created by the Apalachicola River across the mouth of the Chipola. The junction of the Chipola with the Apalachicola was originally just below the lower end of Dead Lake. The Apalachicola carries a much heavier sediment load than the Chipola, and deposits of that sediment raised the bed and banks of the Apalachicola above those of the Chipola at their junction. The bottom of Dead Lake is lower that the bottom of the adjacent section of the Apalachicola, and the basin for the lake is up to lower than the Apalachicola's floodplain. The Apalachicola subsequently shifted most of its flow eastward to a new channel, leaving the old channel as a distributary, the Chipola Cutoff, joining the Chipola River just below Dead Lake. The flow through the Chipola Cutoff is high enough to restrict outflow from Dead Lake, helping to maintain higher water levels in the lake. When the Apalachicola River floods, it can reverse the flow of the Chipola between the lower end of Dead Lake and the junction with the Chipola Cutoff, sending water into the lake. The Chipola River flows another from the junction with the Chipola Cutoff to its junction with the Apalachicola River. Dam A sheetpile dam was constructed at the lower end of Dead Lake in 1960 to stabilize the lake at as high a level as possible. Sport fishing, which had been described as "excellent", declined considerably by the 1970s. Brazilian waterweed and common water hyacinth proliferated, interfering with access by fishermen. Lift gates were added to the dam in 1974 to allow for periodic drawdowns of the lake. Several attempts to draw down the lake in the 1970s were unsuccessful because of the poor design of the gates and high water levels in the Apalachicola River. Sports fishing improved less than had been anticipated from the drawdowns, and the sheetpile portion of the dam was removed in 1987. Boulders that had braced the sheetpiles were initially left in place, but blocked the river bed at low water levels, and were also removed in 1989. By 1993, the number of species of fish found in the lake had increased to 61 from 34 found before the dam was removed. Periodic low water levels led to a restoration of aquatic plants such as alligator weed and improved conditions in other areas used as spawning areas by game fish. ==Hydrology==

The Floridan Aquifer underlies the Dougherty Karst Plain, and is recharged from surface water as well as discharging to springs and rivers on the plain. In the northernmost Chipola watershed the Floridan Aquifer is relatively thin at , consisting of just the Ocala Limestone. The aquifer thickens to the south, reaching about thickness at the southern edge of the Dougherty Karst Plain, with the younger Marianna, Suwannee, and Chattahoochee formations above the Ocala Limstone. The top of the Floridan Aquifer along the Chipola River is about above sea level, and rocks of the formations making up the aquifer are often exposed in the bed of the river. The potentiometric surface of the aquifer is close to the ground level of the river's floodplain, indicating that water from the aquiver also contributes directly to the river's flow. Basins The Northwest Florida Water Management District has divided all but the northernmost part of the Chipola watershed into basins and sub-basins for the purposes of studying water quality, water supply, and natural aquatic habitat area. The Merritts Millpond-Chipola River basin, which includes Greenwood, parts of Jacob and Cottondale, and much of Marianna, is divided into the Waddells Mill Creek, Hayes Spring Run, Muddy Branch-Chipola River, Carters Mill Branch, and Merritts Millpond sub-basins, and has significant areas of water affected by pollution and algal mats and large numbers of assets subject to flooding. The Mill Creek-Chipola River basin, which includes Alford, the northern part of Altha, and the southern parts of Cottondale and Marianna, is divided into the Sapp Bay, Stump Creek, Upper Dry Creek-Chipola River, Lower Dry Creek-Chipola River, Foxworth Mill Creek, Douglas Pond, Rocky Creek-Chipola River, and Mill Creek-Chipola River sub-basins, and has limited areas of water affected by pollution and algal mats and a moderate number of assets subject to flooding. The Chipola River-Tenmile Creek basin includes the southern part of Altha and is divided into the Upper Tenmile Creek, Lower Tenmile Creek, Fourmile Creek-Chipola River, Davis Creek, and Juniper Creek-Chipola River sub-basins and has significant areas of water impaired by bacteria and a moderate number of assets subject to flooding. The Dead Lakes basin includes Wewahitchka and is divided into the Old Camp Four Swamp, Cypress Creek-Dead Lakes, Upper Dead Lakes, Lower Dead Lakes, West Arm of the Dead Lakes, and Douglas Slough sub-basins, and has moderate areas of water affected by pollution and algal mats and a moderate number of assets subject to flooding. It is also at risk of storm surges. Springs A survey of springs in the Chipola River basin conducted in 2002/2003 identified 63 springs, all fed from the Floridan Aquifer in the Dougherty Karst District. Many of the springs are in or adjacent to the river bed, and are difficult to locate when flow rates are low. The Jackson Blue Spring is rated as a first-magnitude spring, nine springs are rated as second-magnitude, seven as third-magnitude, and five as fourth-magnitude. The outflow of some springs cannot be measured because they discharge directly into flow of the Chipola or one of its tributaries. Most of the flow of the Chipola River originates from the springs. ==History==

The Chacato people lived in the upper Chipola valley when Spanish missionaries first reached the neighboring Apalachee Province in the 1630s. Two missions, San Carlos Borromeo and San Nicolás de Tolentino, were established in Chacato territory in present-day Jackson County in 1674, but were abandoned the next year after part of the Chacato people rebelled against the missionaries and then moved westward, and others sought refuge in Apalacheee Province. ==Biota==

Most of the banks of the Chipola River are covered by second-growth forest consisting of Carolina ash, maples, oaks, magnolias, dogwoods, and water tupelos. Invertebrates include the Dougherty Plain cave crayfish, freshwater snails, and freshwater mussels, such as the fat threeridge, listed as critically endangered, and the Chipola slabshell, listed as endangered, which is endemic to the Chipola River after populations in neighboring watersheds have disappeared. Projects protecting and restoring riverbanks along the Chipola are credited with increasing numbers of mussels in the river. Fish found in the Chipola River include the shoal bass, red-breasted sunfish, redear sunfish, bluegill, spotted sunfish, blacktail shiner, coastal shiner, weed shiner, and clear chub. Other animals include the Georgia blind salamander, Barbour's map turtle, rainbow snake, brown water snake, and banded water snake. ==Human use==

The long Chipola River Paddling Trail runs from Florida Caverns State Park South to Scotts Ferry in Calhoun County. Several sections of the river may include fast water and moderate rapids, depending on the stage of the river. One notable section is Look and Tremble Falls. The Hinson Conservation and Recreation Area in Marianna abuts the Chipola River. The Chipola River Wildlife Management Area, also known as the Chipola River Water Management Area, consists of two tracts. The Jackson County tract includes land along Marshall Creek and Cowarts Creek and along the Chipola River from its origin at the junction of those Creeks to the northern boundary of Florida Caverns State Park. The Upper Chipola Recreational Trail system is located in the tract. The Altha tract is in Calhoun County. Both tracts have very limited access by road. Recreational opportunities in both tracts of the management area include hunting, fishing, boating, paddling, pickicking, hiking, primitive camping and wildlife viewing. The Dead Lakes Park near Wewahitcha is operated by Gulf County. ==See also==