Readymixer Posted September 15, 2002 Share Posted September 15, 2002 There are 3 interstate bridges near my home. I have found disks on 2 of them but they don't look like benchmark disks. They dispaly a year (1962) and one displays JS4 and the other JS6. Are these benchmark/survet disks or just a monument on when the bridge was completed? Thanks! Quote Link to comment
survey tech Posted September 15, 2002 Share Posted September 15, 2002 They may be benchmarks, there are many different kinds of disks that have been used in various places. Its hard to tell what the initials represent, it could be some local code system. Quote Link to comment
ArtMan Posted September 16, 2002 Share Posted September 16, 2002 This is only a game, and we don't want any benchmarkers to get hurt. I'd think twice about crawling around an interestate just to find some crummy disk, not unless you've got an orange vest, hardhat, flares, cones and other miscellaneous safety gear out the wazoo. It just ain't worth it. Quote Link to comment
Couch_Potato Posted September 16, 2002 Share Posted September 16, 2002 I've logged 2 markers on bridges of major highways. In both cases I was able to approach the benchmark from below the bridge. I've passed up on several more interstate bridges because the only way for me to approach would be along the highway. I'd rather not find the disk than risk an accident by stopping and walking along the highway. Now as to the original question in this thread, they are most likely survey disks for the state DOT or some such agency. State agencies like that tend to have a network of survey markers that may or may not be part of the NGS database. You most likely found those markers. I'm not lost! I just don't know where I am. Quote Link to comment
Readymixer Posted September 17, 2002 Author Share Posted September 17, 2002 Please understand that I am not strolling down the intersate looking for disks. These are a couple of rural overpasses by my home with very little traffic. Thanks for y'alls concern for my safety though! Quote Link to comment
Red Tractor Posted September 18, 2002 Share Posted September 18, 2002 When I surveyed, with conventional means I would use bridge markers as a BM. All data was available AZ & HZ so I referenced the bridge markers as control. Quote Link to comment
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