VER-94D (Hoopeston)
Illinois State Water Survey
Located in Iroquois County, Illinois, this groundwater monitoring location is associated with a water well in the Sand and gravel aquifers (glaciated regions).
Well Construction
| Depth | Description | |
|---|---|---|
| 0.0-315.0 ft | 2.0 in diameter none casing | |
| - ft | none screen |
| Depth | Lithology | Description |
|---|---|---|
| 0.0-3.0 ft | unknown | clay, black, very silty to clayey silt, crumbly (topsoil) |
| 3.0-9.0 ft | unknown | clay, yellow-brown to olive-brown, moderately silty; sticky |
| 9.0-18.0 ft | unknown | clay, medium gray, slightly to moderately silty; stiff, cuts into "ribbons" (lacustrine?) |
| 18.0-33.0 ft | unknown | clay, medium dark gray, faintly greenish cast; somewhat stiff, slightly sandy, slighty pebbly |
| 33.0-39.0 ft | unknown | clay, gray, sandy (till) |
| 39.0-56.0 ft | unknown | clay, medium dark gray, silty, stiff, very little sand; firm, smooth drilling |
| 56.0-60.0 ft | unknown | clay, greenish-gray, moderately silty, very slightly sandy; with thin brown layers of clay at about 58' |
| 60.0-65.0 ft | unknown | clay, brownish olive gray, gravelly |
| 65.0-89.0 ft | unknown | clay, medium dark gray, sandy, pebbly (till) |
| 89.0-99.0 ft | unknown | sand, olive gray, medium to coarse; with many very fine & fine sand grains, abundant with white rock fragments (limestone?) |
| 99.0-121.0 ft | unknown | clay, gray to pinkish gray, moderately silty, sandy, pebbly (till) |
| 121.0-123.0 ft | unknown | sand & gravel; mostly coarse sand |
| 123.0-130.0 ft | unknown | clay, gray to pinkish gray, moderately silty, sandy, pebbly |
| 130.0-136.0 ft | unknown | sand |
| 136.0-149.0 ft | unknown | clay, gray to pinkish gray, moderately silty, sandy, pebbly |
| 149.0-165.0 ft | unknown | sand, brownish-gray, medium to very coarse; with very fine to medium gravel, lots of black & gray rounded grains up to 3/8" diameter |
| 165.0-171.0 ft | unknown | clay, sandy |
| 171.0-223.0 ft | unknown | sand, gray, medium to very coarse; with very fine to medium gravel & some very fine sand, poorly sorted; fines are mostly rounded shale, limestone & quartz |
| 223.0-233.0 ft | unknown | sand, gray, fine to coarse; finer-grained than overlying interval & tends to be medium sand |
| 233.0-245.0 ft | unknown | sand & gravel, gray; increased percentage of fine gravel (1/4") |
| 245.0-300.0 ft | unknown | sand & gravel, gray, medium to very coarse sand with 3/8" gravel; abundant light gray grains with lesser amounts of white chert & medium brown dolomite fragments in samples |
| 300.0-301.0 ft | unknown | rock; rig chatters loudly as it pushes aside obstruction |
| 301.0-318.0 ft | unknown | sand & gravel; very fine sand to medium gravel, poorly sorted; red grains very common, finer grains typically rounded quartz while others are mostly shale & limestone |
| 318.0-320.0 ft | unknown | shale, bluish to greenish-gray, moderately silty, very calcareous; very hard drilling |
| 320.0-323.0 ft | unknown | dolomite (?), bluish gray, noncalcareous; lithified, is likely fractured as drillstem dropped about 1' at 322 foot depth |
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Agency Illinois State Water Survey Site Name VER-94D (Hoopeston) Site Number P381694 Site Type WELL Lat/Long (WGS84) 40.4879, -87.6897 Well Depth 317.5 Feet Elevation (NAVD88) 714.94 ft Latitude 40.487873 Longitude -87.689725 Local Aquifer Name Mahomet Aquifer (None) National Aquifer Name Sand and gravel aquifers (glaciated regions) (N100GLCIAL) 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 37.64 32.18 29.98 1994-09-07 2025-09-29 137 31.0 34.33 21.74 Statistics Calculated 2025-12-26 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 33.23 33.05 31.65 31.31 30.74 30.27 30.22 18 18 Jun 34.36 34.03 31.90 30.64 30.19 29.99 29.98 17 17 Jul 37.64 36.69 33.30 31.95 30.79 30.62 30.58 13 13 Sep 36.96 36.59 34.25 33.62 32.80 32.18 31.97 22 22 Dec 34.50 34.30 33.47 32.48 31.40 30.97 30.73 16 16 Statistics Calculated 2025-12-26 -
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