HomeMy WebLinkAboutYarmouth USGS streamgage 3.28.2025New USGS Streamgage Installation Design Details, New England WSC, Massachusetts Office
Project: The USGS in cooperation with Massachusetts Department of Recreation propose to install a streamgage at Mill Creek in Yarmouth MA for purposes related to water resource management
for the state and local communities.
Prepared By: Gordon McQuaid, Supervisory Hydrologic Technician
Planned Installation Date: June 1, 2025
USGS ID and Name: N/A, Mill Creek at Yarmouth MA
Location or Address: Approximately 640 - 645 Buck Island Rd Yarmouth MA 02673
Lat/Long: 41.663943, -70.261823 or 41.663796, -70.261877
Illustration of proposed streamgage design:
Drawings are not to scale.
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Details:
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Equipment enclosure:
Equipment enclosure will consist of an aluminum box attached to two 2” galvanized schedule 40 pipes attached directly to culvert. If needed approximately three, 60 lb. bags of fast-setting
concrete may be used to add stability to the legs as needed.
Dimension of enclosure: 40”H X 25”W X 17”D
Motorized post driver may be used to drive 2” galvanized pipe vertical supports depending on the substrate.
Solar array and mast: 2” aluminum schedule 40 conduit, approximately 5 feet above enclosure, with attached antennas and solar array.
Conduit and sensors:
DigSafe to be completed prior to any digging or driving.
Stainless steel or galvanized pipe/conduit to be set horizontally in streambed to house sensor/pressure line.
Vertical anchor (3/4” to 2” gal. pipe) may be utilized to secure sensor line in streambed for stability. Pipe to be driven until refusal in using post driver as needed (typically 4’).
Concrete anchors and brackets may be used to secure conduit to existing stable points in channel (bedrock / large boulders or infrastructure).
Conduit will be attached to wingwall using 3/8” SS drop in anchor bolts and appropriate clamps.
One inch diameter flexible conduit may be buried 6-12” below grade between the enclosure and the wing wall to avoid issues with mowers. On-site conditions will determine placement.
Staff plate will consist of a 2”x8” PT board mounted vertically on wing wall using 3/8” SS drop-in anchor bolts. Ceramic-coated staff plate will be attached to the board using SS wood
screws.
Historic crest stage gage (CSG) may be re-built or repositioned as needed.
Location Map:
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Approximate location (Google maps). Enclosure and equipment are proposed to be placed on the upstream culvert side of the bridge, the right side of channel or downstream location about
10 ft from culvert.
Additional pictures:
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View of wingwall on left bank
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View of downstream side of bridge.
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Off-street parking
Examples of similar design.
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Crest Stage Gage (CSG) details:
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