Gregory David handles empties north out of Lock 6.
| Time and Date: 11:51 AM, Monday, March 29, 2021 | |
| Trempealeau, Trempealeau County, Wisconsin | |
| Approximate Latitude: 44° 0′ 13″ N (44.00381° ) | |
| Approximate Longitude: 91° 26′ 41″ W (-91.44475° ) | |
| Vessel Name: GREGORY DAVID | Owner/Operator: TOWBOATS LLC |
| Official Number: 552069 | IMO: |
| Service: Towing Vessel | Call Sign: WDB9815 |
| Flag: US | Hailing Port: ST LOUIS MO |
| Builder: DRAVO CORPORATION | Builder City, Year Built: NEVILLE ISLAND PA, 1973 |
| Propulsion: Diesel | Horsepower: 6000 |
| Gross Tons: 535 | Net Tons: 363 |
| Length x Breadth: 128 x 42 | Depth: 9.5 (feet) |
| Camera Make: Canon | Camera Model: Canon EOS 70D |
| Shutter: 1/100 | Aperture: 16.0 |
| ISO: 100 | Focal Length: 57 mm; FOV: 22.6 deg |
| White Balance: Daylight | Lens Type: 24-105mm |
| Exposure Mode: Manual | Focus Mode: One-shot AF |
