Investigative insert, Portland, re Columbia River dredging (file copy, page one)
This copy: Part 70 p. 185Also filed at Part 43 p. 376 (primary) · Part 65 p. 150 · Part 69 p. 186
This copy’s own title
Investigative insert re Columbia River dredging at Tena Bar
Document date 13 February 1980
Another copy of this document is the primary, most legible copy: Part 43 p. 376.
Copies may differ in what was redacted.
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Id: Cooper-Part-70:185-185
Subject: Cooper Files: Cooper-Part-70:185-185 Document: Investigative insert re Columbia River dredging at Tena Bar Id: Cooper-Part-70:185-185 Page: https://cooper.theunsolved.net/documents/Cooper-Part-70%3A185-185 What is wrong (title, date, type, which pages belong together, copies)? What does the scan show?
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FBI 164-81, Vault Part 70 p. 185 (DB Cooper-29988), Report, dated 13 Feb 1980 — cooper.theunsolved.net/documents/Cooper-Part-70%3A185-185
SE 164-81 PD 164-41 [redacted] 1
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[guess: Alice] [guess: C.,D] M
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The following investigation was conducted by SAs [redacted] on February 13, 1980:
AT PORTLAND, OREGON
[redacted], Waterways Maintenance Branch, Navigation Division, U.S. Army Engineer District, 319 S.W. Pine, telephone [redacted], was contacted regarding dredging operations on the Columbia River since November 24, 1971. The purpose of obtaining this information was to determine if it was possible that the bait money located on the beach property on the [redacted] Vancouver, Washington, on February 10, 1980, could have been placed there through dredging operations on the Columbia River.
[redacted], after a review of his records, advised that the only dredging operation between November 24, 1971, and the present in the vicinity of the [redacted] was during August 6 through September 18, 1974.
Material dredged from the river channel in the Columbia River was placed in several locations on or near the [redacted] as well as one location across the river on the Oregon side.
The dredge material deposited at the site where the money was located came from the north half of the ship channel, which is 300 feet wide, between river mile 96 plus 38 feet and river mile 97 plus 17 feet. This material was deposited on the beach area of the [redacted] between August 19 through the 25th, 1974, and consisted of 91,100 cubic yards of fill.
The channel is maintained at 40 feet in depth and all the material above 40 feet is dredged out. The dredge "Washington" of the General Construction Company did the dredging on this project. It had a 24 inch pipe with wiper bar inside the pipe. The wiper bar keeps large objects such as rocks from passing through the pipe. [redacted] [redacted] stated it would be possible for a 16x16x4 inch pack- age to get through the pipe; however, it is likely that a package that size or a human body or parts thereof would [illegible].
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SUB/M [guess: S] 16c1 81-[illegible] DB Cooper-29988
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