Parked Vehicles that had Crossed Leaburg Dam 2013-06-29 to 2013-11-04
The National Bridge Inventory entry for Leaburg Dam lists the average daily traffic across the bridge at 190. I presume that means vehicles. I typically get up to the dam once a day because it's on the way to our mail box, and I'm doing the data collection you see below. The vehicle counts are of vehicles parked within approximately 75 yards of the Dam roadway. Boat trailers are significant because they're typically pulled by pickups or SUVs, and that means they have to come to a near-complete stop for each axle for each speed bump. EWEB's presence is of interest because the safety of EWEB personnel is a legitimate concern, although I disagree strongly with the view of the one EWEB employee I've talked with so far. As I understood him, he felt that safety completely trumps other considerations. He was adamant that the speed bumps would stay. The conversation was, by the way, polite on both sides. The pedestrian count is of interest as a separate count because, unlike EWEB personnel who can be expected to conform to reasonable safety practices, the same cannot be said of the general public.
Starting on Tuesday, 2013-09-10 (line 61) I began walking across the Dam, picking up any solid pieces I found that conceivably could have been attached to a vehicle and had come off. I started doing this when a friend told me a part of his vehicle came off when he was crossing one of the speed bumps, and I was curious if that might have happened to others. That first day I picked up 56 pieces, and they continued to trickle in through the end of the survey period.
|2013-07-10||12:00||Wednesday||4||1 vehicle||note #1|
- 2013-07-10 One vehicle almost done crossing hatchery-side to highway-side, one vehicle waiting on highway-side. First of four McKenzie Fire & Rescue (MFR) fire trucks stops on hatchery-side to let the waiting highway-side vehicle cross when it can. While it's crossing, three more MFR fire trucks pull up behind the first. Then, as the first MFR vehicle starts across the dam, two more vehicles join the hatchery-side line. The MFR vehicles have to come to an almost-complete stop while crossing. Result is five vehicles on the dam, four of them heavyweights, and quite a delay for those behind them. I didn't stick around to see what the lineup on the highway side became.
I would hope that if the MFR vehicles were going to a fire, they would be able to cross the bumps faster, but that may not be the case. An ITE paper on the reduced emergency response delay caused by speed humps shows the delay to be between 12 and 27 seconds per hump. Note that the paper deals with speed humps, not speed bumps, which are worse. My seat-of-the-pants guess for the delay for a fire truck negotiating the existing speedbumps on the dam would be around two minutes. I don't know how significant a two-minute delay is in fighting a house fire, but I know that when it comes to aircraft fires, a two-minute delay is critical.
- 2013-07-16 When returning from Vida, we were number 6 on the dam due to a really slow number 1. In all the years before the current speed bump installation, we were never more than number 3 on the dam that I can recall. Certainly never more than number 4.
- 2013-08-01 The upstream side of one of the speedbumps has had one or more of it's bolts broken, which allows it to pivot on the remaining bolt(s), thus widening the middle break for that speed bump.
- 2013-08-05 Today was the first day since starting this record that I saw an EWEB worker on the dam. He appeared to be working on one of the speed bumps. Prior to today the only EWEB presence I've seen is a pickup or panel truck parked off to the side on the Hatchery bank of the river.
- 2013-08-11 A large motorhome and a big toy hauler were parked next to the education center. It would have been interesting to have watched them negotiate the speedbumps on the dam.
- 2013-08-24 I happened to arrive at the dam at the same time the LTD bus was discharging passengers, 3 of which crossed the dam.
- 2013-10-18 All 15 pedestrians on the bridge belonged to a single group according to one of them that I stopped and spoke with. Most were standing on the downstream side of the roadway looking down the river. Some were taking pictures.
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