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Occasionally you\u2019ll see larger disks of 3 ¾\" diameter which are \"Class A\" monuments, and some benchmarks are set in retaining walls, bridge wing walls, culvert headwalls, concrete steps, or wherever the most stable and accessible placement was determined to be for a specific location. You might also see benchmarks similar to those of the City of Portland\u2019s but with another governmental agency\u2019s or private firm\u2019s name stamped on it. Occasionally the City of Portland Benchmark Book will refer to these monuments and provide elevations, but more often you\u2019ll have to contact the appropriate institution for more information. 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