Location

The East Osage River Basin lies in the central Missouri counties of Osage, Maries, Cole, Pulaski, Miller, Camden, Morgan, Benton, Laclede, and Hickory (Figure Lo01). Hereafter, the term "basin" shall refer to the East Osage River Basin as covered in this document, unless otherwise specified. The basin as described in this Watershed Inventory and Assessment starts at the Osage River-Missouri River confluence (River Mile (RM) 130.2) at T44N, R10W, Section 5 near Jefferson City, MO. It initially extends southwestward upstream along the Osage River to the basin's near center point at Bagnell Dam at T40N, R15W, Section 19. From this point, the basin extends both westward and southward. The western leg extends upstream on Lake of the Ozarks (LOZ) Reservoir and ends at Harry S Truman Reservoir (HST) at T40N, R23W, Section 17 near Warsaw, MO. The southern leg extends southward from Bagnell Dam along Wet Glaize and Dry Auglaize creeks and ends in the upper most reaches of Goodwin Hollow, a major tributary to Dry Auglaize Creek, near Lebanon, MO.

The basin encompasses 2,474.52 sq. mi2 as outlined in this document and includes the Osage River and all tributary streams except the Niangua River and its tributaries and the Osage River upstream of Truman Dam. The Niangua River Basin and the West Osage River Basin are both tributary basins to the East Osage River Basin (Figure Lo02) and are covered in separate basin Inventory and Assessments.

The basin is divided into two 8-digit HUCs by the USGS; the Lake of the Ozarks HUC -10290109 (1,392.98 sq. mi2) and the Lower Osage HUC -10290111 (1,081.54 sq. mi2). These HUCs are further divided by the USGS into fourteen subunits or 11-digit HUCs (Figure Lo03) as a means of managing these basins and their basin-related information. Throughout this document the 14 USGS 11-digit HUCs will be referred to as subbasins to facilitate discussion of the large diverse basin area (Table Lo01, Table Lo02) . Hereinafter, each subbasin will be referred to by the name below of that subbasin.

  1. Lower Osage River Subbasin
  2. Lower Maries River Subbasin
  3. Upper Maries River Subbasin
  4. Little Maries River Subbasin
  5. Tavern Creek Subbasin
  6. Wet Glaize Creek Subbasin
  7. Dry Auglaize Creek Subbasin
  8. Lower LOZ Hills Subbasin
  9. Deer Creek Subbasin
  10. Turkey Creek Subbasin
  11. Cole Camp Creek Subbasin
  12. Upper LOZ Hills Subbasin
  13. Gravois Arm Subbasin
  14. Miller County Osage River Hills Subbasin

A major feature of the basin is Lake of the Ozarks. Construction of Bagnell Dam began in 1929. The dam began impounding water in 1931 to form Lake of the Ozarks. Lake of the Ozarks, Missouri's second largest reservoir, covers 55,000 acres and has over 1,300 miles of privately-owned shoreline. Bagnell Dam is owned and operated by AmerenUE.

Outside basins which surround the East Osage River Basin include: Lamine River Basin, Moreau River Basin, Missouri River Basin, Gasconade River Basin, Niangua River Basin, Pomme de Terre River Basin, West Osage River Basin, and South Grand River Basin.

Figure Lo01: Counties which include portions of the East Osage River basin

Map of counties which include portions of the East Osage River basin

Figure Lo02: East Osage River basin in relation to rivers of tributary basins

Map of East Osage River basin in relation to rivers of tributary basins

Figure Lo03: Subbasins of the East Osage River basin

Map of subbasins of the East Osage River basin

Table Lo01: 11-digit hydrologic units making up the East Osage River Basin

11-digit hydrologic units making up the East Osage River Basin

Table Lo02: Stream name, order, unimpounded length, impounded length, length influenced by Bagnell Dam discharge

Stream name, order, unimpounded length, impounded length, length influenced by Bagnell Dam discharge, and confluence for fourth-order and larger streams in the East Osage River Basin