Oakdale-Sil.
Iowa Geological Survey
Located in Johnson County, Iowa, this groundwater monitoring location is associated with a water well in the Silurian-Devonian aquifers.
Well Construction
| Depth | Description | |
|---|---|---|
| 0.0-164.0 ft | 6.0 in diameter steel casing | |
| -2.4-319.0 ft | 5.0 in diameter steel casing | |
| 310.0-361.5 ft | 4.0 in diameter steel casing |
| Depth | Lithology | Description |
|---|---|---|
| 0.0-2.0 ft | Quaternary | No Color Noted soil or fill |
| 2.0-15.0 ft | Quaternary | Brown/Yellowish clay |
| 15.0-21.0 ft | Quaternary | Gray/Yellowish loess |
| 21.0-28.0 ft | Quaternary | Gray/Bluish clay |
| 28.0-33.0 ft | Quaternary | Gray/Olive clay |
| 33.0-36.0 ft | Quaternary | Gray/Yellowish clay |
| 36.0-41.0 ft | Quaternary | Green/Yellowish till |
| 41.0-46.0 ft | Quaternary | Brown/Yellowish sand and gravel |
| 46.0-74.0 ft | Quaternary | Brown/Yellowish till |
| 74.0-80.0 ft | Quaternary | Gray/Yellowish till |
| 80.0-135.0 ft | Quaternary | Gray/Bluish till |
| 135.0-137.0 ft | Quaternary | Gray sand and gravel |
| 137.0-142.0 ft | Quaternary | Gray/Bluish till |
| 142.0-171.0 ft | Quaternary | No Color Noted till |
| 171.0-172.0 ft | Devonian-Coralville | Gray limestone |
| 172.0-188.0 ft | Devonian-Coralville/Little Cedar | Tan limestone |
| 188.0-228.0 ft | Devonian-Little Cedar | Gray limestone |
| 228.0-282.0 ft | Devonian-Little Cedar/Pinicon Ridge | Tan limestone |
| 282.0-298.0 ft | Devonian-Pinicon Ridge | Brown dolomite |
| 298.0-313.0 ft | Devonian-Pinicon Ridge | No Color Noted limestone and shale |
| 313.0-327.0 ft | Devonian-Otis | No Color Noted dolomite and shale |
| 327.0-339.0 ft | Devonian-Otis | Gray dolomite |
| 339.0-355.0 ft | Devonian-Otis;Silurian-Scotch Grove | Green shale |
| 355.0-361.5 ft | Silurian-Scotch Grove | Tan dolomite |
| 361.5-518.0 ft | Silurian-Scotch Grove/Hopkinton/Blanding | Buff dolomite |
| 518.0-531.5 ft | Silurian-Blanding;Ordovician-Maquoketa | Green shale |
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Agency Iowa Geological Survey Site Name Oakdale-Sil. Site Number 30000 Site Type WELL Lat/Long (WGS84) 41.7066, -91.606 Well Depth 532 Feet Elevation (NAVD88) 810.0 ft Latitude 41.70656739 Longitude -91.60598071 Local Aquifer Name Silurian Aquifer (None) National Aquifer Name Silurian-Devonian aquifers (N400SLRDVN) Aquifer Type CONFINED Water-Level Well Type Trend Water-Level Well Characteristics Known Changes Water Quality Network Additional info Link 1 -
Activity Start Date Activity Start Time Characteristic Name Measure Value Units Detection Limit Value Type Sample Fraction Method Name Analytical Method System Sample Method ID Sample Method ID Context Sample Method Name Activity Type Code Data Provided By -
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How do we calculate statistics?
Overall Water Level Statistics (Depth to water, feet below land surface) Lowest Water Level Median Water Level Highest Water Level First Measurement Date Last Measurement Date Number of Measurements Years of Record Latest Value Latest Percentile 273.80 230.75 206.30 1990-01-02 2025-03-13 195 35.2 268.80 0.0 Statistics Calculated 2025-04-22 Monthly Water Level Statistics (Depth to water, feet below land surface) Month Lowest Median 10th Percentile 25th Percentile 50th Percentile 75th Percentile 90th Percentile Highest Median Number of Measurements Years of Record Feb 230.11 230.01 229.00 222.70 215.20 211.20 210.30 11 11 Mar 268.80 265.50 263.80 241.11 224.90 221.97 221.90 19 19 Jun 272.60 268.58 265.50 239.39 227.81 224.30 207.40 21 21 Aug 254.09 250.25 241.90 233.80 231.30 217.70 216.50 13 13 Sep 273.80 272.90 265.20 242.01 235.60 230.00 229.90 19 19 Nov 243.44 242.59 234.02 228.30 219.95 213.53 212.90 10 10 Dec 268.40 267.10 261.20 233.31 226.47 220.00 216.60 19 19 Statistics Calculated 2025-04-22 -
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