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The Ohio Department of Transportation, Division of Highways, proposes to replace a three-span arch bridge across Paint Creek on South Paint Street in Chillicothe, Ohio with a new deck-type structure resting on four sets of piles and four piers. Profiles of the 10-, 25-, 50-, and 100-year floods under present conditions and under conditions modified by construction of the new bridge are presented in this report. The results indicate that the construction of the new bridge will not cause significant changes in the flood profiles or the areas inundated. INTRODUCTION The Ohio Department of Transportation, Division of Highways (ODOT) proposes to replace a 320-foot long three-span arch bridge on State Route 772 (South Paint Street) in Chillicothe with a 590-foot long deck-type bridge resting on four sets of piling and four piers. A hydraulic analysis of the effect of this project on the elevation of flood waters on Paint Creek upstream from the bridge was requested by ODOT. Profiles of the 10-, 25-, 50-, and 100-year frequency floods under present and modified conditions were requested for a reach of Paint Creek between the bridge and a point about 3 miles upstream (fig. 1). The purpose of this report is to present the results of the analysis of flood profile elevations under present and modified conditions in the designated reach. All elevations in the report are referenced to the National Geodetic Vertical Datum of 1929 (NGVD of 1929). This investigation is part of a continuing cooperative program between the Ohio Department of Transportation, Division of Highways (ODOT) and the U.S. Geological Survey (USGS). 83 °0 1' 83 °0 0' 82 °5 9' 82 °5 8< 39 19 K ) 39 ° 1 8' C ro M M ct te n S C A LE 1 :2 4, 00 0 B as e fr om U .S . G eo lo gi ca l S u rv ey C hi lli co th e W es t, 19 71 a nd C hi lli co th e E as t, 19 71 10 00 20 .0 0 30 00 40 00 50 00 1M IL E 6 00 0 F E E T F i g u r e 1 . S t u d y ar ea , P a i n t C r e e k at S t a t e R o u t e 77 2, C h i l l i c o t h e , Oh io . Available Data Cross sections at selected sites in the designated reach and a map showing the stream channel and structures were provided by ODOT from aerial and ground surveying. ODOT also furnished plans for the proposed bridge (fig. 2) and approach roadway. Cross-section data at the present three-span arch bridge were available from a study made in 1966 by the U.S. Geological Survey. The underwater cross-section elevations for sections downstream from the bridge were obtained from a low-flow study made by the Meade Paper Co. (1978). DESCRIPTION OF AREA The area investigated includes a reach of Paint Creek together with its adjoining flood plain in the vicinity of the South Paint Street (State Route 772) bridge in Chillicothe, Ohio. The step-backwater model used starts at a rating section (section 10), 4,000 feet downstream from the bridge, and ends at section 26, about 21,000 feet upstream from the bridge (fig. 1). In this reach the channel makes long gentle meanders in a 3,000-foot wide flood plain. The last meander upstream from the bridge encompasses a flood plain on the right bank of about 260 acres which has been lightly developed for residential use. This flood plain segment is partly protected by a levee along an arc of the channel between river distance 10,160 feet (section 20) and river distance 6,600 feet (fig. 1). Only lower magnitude floods (those having less than a 10-year frequency) are diverted from the flood plain by this levee. Prior to the operation of Paint Creek dam (fig. 3), for flood-control in 1974, this area was flooded every few years. The road leading to the present bridge and that designed for the new structure are low-level roads generally at about the elevation of the land they cross. The right bank flood plain downstream from the bridge contains large settling ponds built by the Meade Paper Co. A landfill of about 80 acres extends along the left bank flood plain between points 2,000 feet and 5,000 feet upstream from (west of) the bridge.

Hydraulic analysis, Paint Creek at State Route 772, Chillicothe, Ohio