Printed on recycled paper

Potentiometric Surface of the Mississippi River

Valley Alluvial Aquifer, Spring 2012

By

T.P. Schrader

2015

NOTE: The potentiometric contours are generalized

to portray synoptically the head in a dynamic hydrologic

system, not taking into account the variation in well

depth, nonsimultaneous measurements of water level,

variable effects of pumping, and changing climatic

influence. The potentiometric contour may not conform

exactly with individual measurements of water level.

Cone of depression and other areas of reduced water level

Western limit of Mississippi River Valley alluvial aquifer

Potentiometric contour—Shows altitude at which water level would

 have stood in tightly cased wells. Dashed where approximately

 located. Hachures indicate depression. Contour interval 20 feet.

 Datum is National Geodetic Vertical Datum of 1929 (NGVD 29)

Direction of groundwater flow

Observation well completed in Mississippi River Valley alluvial aquifer—

 Measurement made in spring 2012. Value is water-level altitude.

 Datum is NGVD 29. Letters, when present, represent hydrographs in

 figure 4

EXPLANATION

100

Q 172

m

0 10 20 30 40 MILES

0 10 20 30 40 KILOMETERS

Base from U.S. Geological Survey digital data, 1:500,000

Universal Transverse Mercator projection, zone 15

North American Datum of 1927

Prepared in cooperation with the

Arkansas Natural Resources Commission 

and the

Arkansas Geological Survey

U.S. Department of the Interior

U.S. Geological Survey

Scientific Investigations Report 2015–5059

Potentiometric surface of the alluvial aquifer, 2012—PLATE 1

Schrader, T.P., 2015, Water levels and water quality in the

 Mississippi River Valley alluvial aquifer

 in eastern Arkansas, 2012

TENNESSEE

MISSISSIPPI

ARKANSAS

LOUISIANA

MISSOURI

ARKANSAS

ARKANSAS

Study area

Crowleys Ridge

Crowleys

Ridge

Crowleys

Ridge

CLAY

GREENE

MISSISSIPPI

CRAIGHEAD

JACKSON

POINSETT

CROSS

CRITTENDEN

WHITE

WOODRUFF

ST. FRANCIS

LEE

PRAIRIE

MONROE

PULASKI LONOKE

JEFFERSON

ARKANSAS

PHILLIPS

LINCOLN DESHA

DREW

CHICOT

ASHLEY

INDEPENDENCE

LAWRENCE

RANDOLPH

MISSISSIPPI

RIVER

RIVER

MISSISSIPPI

White River

Arkansas River

m

m

m

m

m

m

m

m

m

m

m

m

m

m

m

m

m

m

m

m

m

m

m

m

m

m m

m

m

m

m

m

m

m

m

m

m

m

m

m

m

m

m

m

m

m

m

m

m

m

m

m

m

m

m

m

m

m

m

m

m

m

m

m

m

m

m

m

m

150

160

170

140

130

180

120

190

200

210

110

177

178

190

137

159

140

160

152

166

164 162 151

162

168

177

126 129

135

121

151

155 153 159

152

110 122

142

150

177

178

190

137

159

140

160

152

166

164 162 151

162

168

177

126 129

135

121

151

155 153 159

152

110 122

142

150

Inset

170

180

190

160

200

140

150

130

120

200

110

100

220

90

260

230 240

270

250

80

280

120

100

170

170

160

110

260

140

260

150

180

80

230

100

130

180

80

210

180

110

140

160

100

180

220

90

110

190

260

220

280

250

90

100

280

100

90

270

120

180

220

130

150

230

200

240

150

160

160

190

120

170

130

260

190

140

210

120

90

210

220

240

160

260

120

140

150

160

160

98 94 95 94

90

86

99

91

87

84

81

87

92 84

94

94 96 92

88

89

79 89

89

75

81

78

96 97

89

84

89

96

94

94

81

90

73

88

97

95

90

202

202

193

207

190 188

175

187

194

165

184

182

184

178 147 145

150

169

182

178 148 131

174

199

201

189

192

219

221

207

153

197

199

204

195

194

162

155 160 151 152 140

175

172

158 152

137

139

173 146 134

146

254

266

260

269

269

256

256

231

232

250 248

247 250

250

207 201

226

144

127

133 175

144

178

123

115 108 119

106

135

138

172

109

112

102

107

116 115

101

209

210

216

206

156 207 146

140

135

148

123

122 154

182

194

201

199

200

194

130 196

134

128

131

135

144147

187

197 194 147 137 129 131142

131

126

125

140 121

144

132

141

142 143

142

165 151

171

146

161

152

153 157

183 182

149

172

158

172 159

154

173 136

157

152

139 145

157

159

161

135133

135

140 160

154

156 157

113 159

161 139

133

241

225

225

223 229

215 217

218

215

198

187 164

163

146

148 138

152

138

231

213

206

157

147

126 119 125

121

120

216 141

145

144

133

138

131 131

159

110

143 133

126

141 151

174

181

181

184 155

169

158

153

162 165

131

134

175

172

173

168

169

155

123

138

148 148

186 175

181

170

170

165 146 164

138

210

201 199 196

200

182

164

183 170

160

176

177 156

154

204

189

176

147 186

149

206

200

200

210

184 156

172

200

191

152

222 225

210

209

235 276

252

247

255 265 235

239

235

236

230

240

245

232

227

230

223

221

231

214

223

221

221

224

130

114

132 114 108

143

115

112

128

146

124

128

112

119

108

119

126

106

106

111

128

118

118

120 112

117

133

140

181 176

141 188

141

132

130 132

130

139

132

177

179

131

132

142 135

133

167

171 175168

177 182

175

153

150

145 146

144

138

137

143

143 137 137

137

165

188

192

188

186 190

205

170

184

184

186

189

185

192

217

224 224

212

221

216 223

219

218

169

176 182

185

187

194

207

218

218

216

215 213

215

198

204

140

133

168 173

281 279

288 278

273

281

286

274

279

280

281

264

274

267

267

253

268

253

265

261

276

279

258

265

251

256 252

251

250

106

103

103

102

107

103

102

108

202

157 138

164

153

145 135

123

105

114

184

161

134

120 110

137

156

102 106

129

134

147

130

111 104

104

104

102

101

134

113

90

205

179

265

263

248

144

128

113

116

135

128 132

142

181

130

103

193

130

144

159

164

139

136

170

156

175

260

123

113

158

141

153

222

205

256 257 251

127

115

104

98 94 95 94

90

86

99

91

87

84

81

87

92 84

94

94 96 92

88

89

79 89

89

75

81

78

96 97

89

84

89

96

94

94

81

90

73

88

97

95

90

202

202

193

207

190 188

175

187

194

165

184

182

184

178 147 145

150

169

182

178 148 131

174

199

201

189

192

219

221

207

153

197

199

204

195

194

162

155 160 151 152 140

175

172

158 152

137

139

173 146 134

146

254

266

260

269

269

256

256

231

232

250 248

247 250

250

207 201

226

144

127

133 175

131 144

178

123

115 108 119

106

135

138

172

109

112

102

107

116 115

101

209

210

216

206

156 207 146

140

135

148

123

122 154

182

194

201

199

200

194

130 196

134

128

131

135

144147

187

197 194 147 137 129 131142

131

126

125

140 121

144

132

141

142 143

142

165 151

171

146

161

152

153 157

183 182

149

172

158

172 159

154

173 136

157

152

139 145

157

159

161

135133

135

140 160

154

156 157

113 159

161 139

133

241

225

225

223 229

215 217

218

215

198

187 164

163

146

148 138

152

138

231

213

206

157

147

126 119 125

121

120

216 141

145

144

133

138

131 131

159

110

143 133

126

141 151

174

181

181

184 155

169

158

153

162 165

131

134

175

172

173

168

169

155

123

138

148 148

186 175

181

170

170

165 164146

138

210

201 199 196

200

182

164

183 170

160

176

177 156

154

204

189

176

147 186

149

206

200

200

210

184 156

172

200

191

152

222 225

210

209

235 276

252

247

255 265 235

239

235

236

230

240

245

232

227

230

223

221

231

214

223

221

221

224

130

114

132 114 108

143

115

112

128

146

124

128

112

119

108

119

126

106

106

111

128

118

118

120 112

117

133

140

181 176

141 188

141

132

130 132

130

139

132

177

179

131

132

142 135

133

167

171 175168

177 182

175

153

150

145 146

144

138

137

143

143 137 137

137

165

188

192

188

186 190

205

170

184

184

186

189

185

192

217

224 224

212

221

216 223

219

218

169

176 182

185

187

194

207

218

218

216

215 213

215

198

204

140

133

168 173

281 279

288 278

273

281

286

274

279

280

281

264

274

267

267

253

268

253

265

261

276

279

258

265

251

256 252

251

250

106

103

103

102

107

103

102

108

202

157 138

164

153

145 135

123

105

114

184

161

134

120 110

137

156

102 106

129

134

147

130

111 104

104

104

102

101

134

113

90

205

179

265

263

248

144

128

113

116

135

128 132

142

181

130

103

193

130

144

159

164

139

136

170

156

175

260

123

113

158

141

153

222

205

256 257 251

127

115

104

F

E

M

BB

N

O

FF

I

G

U

J

X

DD

H

EE

CC

Q R V

W

A

T

P

AA

Z

B

S

K

L

C

D

Y

92°

91°

90°

36°

35°

34°

92°

91°

90°

36°

35°

34°

33° 33°