Oakdale-Dev
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 | |
|---|---|---|
| -2.4-175.0 ft | 5.0 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 loess |
| 15.0-21.0 ft | Quaternary | Gray/Yellowish loess |
| 21.0-28.0 ft | Quaternary | Gray/Bluish clay |
| 28.0-35.0 ft | Quaternary | Gray/Olive clay |
| 35.0-40.0 ft | Quaternary | Brown clay and sand |
| 40.0-42.0 ft | Quaternary | Brown/Yellowish till |
| 42.0-45.0 ft | Quaternary | No Color Noted sand and gravel |
| 45.0-81.0 ft | Quaternary | Brown/Yellowish till |
| 81.0-89.0 ft | Quaternary | Gray till |
| 89.0-135.0 ft | Quaternary | Gray/Bluish till |
| 135.0-171.0 ft | Quaternary | No Color Noted sand and gravel |
| 171.0-175.0 ft | Devonian-Coralville | Brown limestone |
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Agency Iowa Geological Survey Site Name Oakdale-Dev Site Number 30500 Site Type WELL Lat/Long (WGS84) 41.7066, -91.6059 Well Depth 301 Feet Elevation (NAVD88) 810.0 ft Latitude 41.70656673 Longitude -91.60593439 Local Aquifer Name Devonian aquifer (None) National Aquifer Name Silurian-Devonian aquifers (N400SLRDVN) Aquifer Type CONFINED Water-Level Well Type Trend Water-Level Well Characteristics Suspected / Anticipated 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 243.00 216.43 198.65 1990-01-23 2025-03-13 109 35.2 238.50 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 Mar 238.50 237.30 233.95 216.52 210.48 207.19 206.09 20 20 Jun 240.70 239.90 237.25 219.66 212.56 206.30 198.65 21 21 Sep 243.00 243.00 238.97 222.93 217.88 216.53 214.21 18 18 Dec 239.50 238.20 234.20 215.66 209.69 206.38 205.32 19 19 Statistics Calculated 2025-04-22 -
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