RM 09-06-74 - Laserfiche WebLink

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8. JOLD BUSINESS (COh Replying to Mr. Wiggins' question relating to the Colfax Bridge problem; Mr. Dan Lawson replied that when the Colfax Bridge was being modified, it was construction of floodway, so the Department of Natural Resources had issued a permit to cover that work and he believed it was issued with the stipulation that the waterway open- ing would not be diminished; in fact; to build that bridge we would need some additional waterway opening. At that time, they proposed to put it on the east side of the river and this waterway opening has never been provided so the pier on the west side is not skewed parallel to the other piers and this causes construction that the BNR objects to. In the terms of the overall development, they give.no timetable of correcting this problem, but they do expect it to be corrected. Mr. Wiggins asked in the process of this dredging if there is any possibility of damage to the piers or foundation of the piers? Mr. Tom Oesterling with CEW stated he did recall something about plans that there was something noted about the future lowering of that stream and if anyone else recalled seeing the article. Mr. Lennon said he has the minutes going back to when the change orders were approved, back in '71, when Mr. Kenneth P. Herceg was with City Engineering at that time (Mr. Herceg is with CEW now), and also a letter from Mr. John A. Middleton (with CEW at that time) dated August 14, 1970, addressed to Mr. Ashen - felter, having to do with the gradient and the result- ing elevation difficulty matching St. Joseph Street to the existing Colfax Bridge. Mr. Lennon said, as he understands it, it is strictly the piling or base is going in a different direction than the rest of the Bridge, and in so doing, it is approximately 30 feet in dredging. Mr. Lawson said is is 30 feet x 70 feet, and partially out in the center as well. But to answer the question, they would protect the bottom after dredging with dump rip - rap, and also what is called debris, that is actually a kind of protection.to prevent erosion, so we can ac tually control scouring through there and avoid damaging and undermining piers As to Mr. Wiggins' statement that this may not be the main channel, Mr. Lawson said not normally, but when it gets up to flood stage -- five -year flood - -we would actually get quite a bit of water over into this area, and then on a "good year flood ", portions of the area would build up-near the bottom-of the Colfax- Bridge and the east part of it would be under water. A term- - "a dirty storm that occurs once in every 100 years." - 10 -