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The Deckers Creek drainage basin covers approximately 16,600 ha in Monongalia and Preston Counties of West Virginia. The purpose of this study was to evaluate water quality changes over 25 years from samples taken in 1974 and 1999. A 1974 study examined the water chemistry in Deckers Creek over a six-month period at 29 sample points. Water samples from the same sites were collected monthly and analyzed in 1999. Most of the tributaries sampled in 1999 showed improved chemistry compared to 1974, as did the main stem of Deckers Creek above the town of Richard. Decreased mining activity, stricter reclamation standards, and improved deep mine discharge qualities have led to improved water conditions in the upper portion of Deckers Creek. A large-volume deep mine discharge near Richard, located 3 km upstream of the mouth, has degraded the lower portion of Deckers Creek since 1974. Below Richard, the water in the creek is of very poor quality because of the excessive acid and metals input at Richard, even though good quality tributaries also enter downstream. With the improvement in chemical properties in the majority of the creek, biological contamination in the form of fecal coliform bacteria will become more apparent and present a new water quality problem. Additional keywords: reclamation, underground mining, acidity, iron, fecal coliforms

CHANGES IN WATER QUALITY IN DECKERS CREEK FROM 1974 TO 1999