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.

daydatetimeday of
week
boat
trailers
EWEB
presence
pedestrians
on bridge
roadway
pieces
notes
2013-06-2912:30Saturday13
2013-06-3018:55Sunday5
2013-07-0110:15Monday51 vehicle
2013-07-0212:30Tuesday7
2013-07-0311:45Wednesday6
2013-07-0413:35Thursday11
2013-07-0513:35Friday10
2013-07-0612:00Saturday14
2013-07-0713:10Sunday11
2013-07-0816:00Monday3
2013-07-1012:00Wednesday41 vehiclenote #1
2013-07-1213:35Friday4
2013-07-1313:10Saturday73
2013-07-1412:30Sunday62
2013-07-1510:15Monday31 vehicle
2013-07-1611:20Tuesday4note #2
2013-07-1712:30Wednesday83
2013-07-1811:30Thursday81 vehicle
2013-07-1912:30Friday7
2013-07-2011:50Saturday9
2013-07-2112:20Sunday10
2013-07-2210:20Monday3
2013-07-2308:30Tuesday6
2013-07-2411:45Wednesday4
2013-07-2514:00Thursday3
2013-07-2612:15Friday3
2013-07-2711:45Saturday4
2013-07-2811:20Sunday8
2013-07-2912:45Monday21 vehicle
2013-07-3011:30Tuesday3
2013-07-3116:30Wednesday4
2013-08-0116:30Thursday5note #3
2013-08-0220:20Friday4
2013-08-0313:15Saturday4
2013-08-0510:20Monday1 vehicle
1 person
note #4
2013-08-0611:10Tuesday4
2013-08-0720:00Wednesday2
2013-08-0811:45Thursday2
2013-08-0911:15Friday4
2013-08-1011:40Saturday2
2013-08-1111:15Sunday51note #5
2013-08-1209:15Monday2
2013-08-1313:15Tuesday2
2013-08-1613:30Friday4
2013-08-1719:30Saturday4
2013-08-1811:20Sunday4
2013-08-1916:05Monday1
2013-08-2112:10Wednesday2
2013-08-2213:20Thursday1 vehicle
2013-08-2313:00Friday3
2013-08-2417:10Saturday33note #6
2013-08-2711:40Tuesday11
2013-08-2812:55Wednesday22 vehicles
5 people
2013-08-2915:10Thursday1
2013-08-3111:05Saturday1
2013-09-0110:20Sunday4
2013-09-0411:55Wednesday1
2013-09-0613:15Friday1
2013-09-0818:10Sunday1
2013-09-0917:45Monday1
2013-09-1019:10Tuesday256
2013-09-1417:15Saturday1
2013-09-1514:10Sunday2
2013-09-1712:10Tuesday26
2013-09-1812:40Wednesday27
2013-09-1911:15Thursday110
2013-09-2012:40Friday37
2013-09-2117:20Saturday36
2013-09-2310:20Monday2 vehicles
1 person
2013-09-2516:00Wednesday1
2013-09-2611:40Thursday2
2013-09-2715:30Friday1
2013-09-3010:20Monday1 vehicle
2013-10-0115:50Tuesday3
2013-10-0315:10Thursday1
2013-10-0413:45Friday1
2013-10-0515:55Saturday25
2013-10-0616:30Sunday15
2013-10-0710:30Monday1
2013-10-1314:10Sunday11 person1
2013-10-1410:20Monday2
2013-10-1516:35Tuesday11
2013-10-1614:30Wednesday2
2013-10-1813:30Friday315note #7
2013-10-1913:40Saturday3
2013-10-2211:20Tuesday23
2013-10-2616:20Saturday1
2013-11-0410:30Monday1
daydatetimeday of
week
boat
trailers
EWEB
presence
pedestrians
on bridge
roadway
pieces
notes

Notes

  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.
  2. 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.
  3. 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.
  4. 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.
  5. 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.
  6. 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.
  7. 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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