As described by the National Geodetic Survey in 1978:
"0.3 MI SE FROM WALLER.
ABOUT 0.3 MILE SOUTHEAST ALONG U.S. HIGHWAY 290 FROM THE JUNCTION OF ALLIANCE STREET AND U.S. HIGHWAY 290 IN WALLER. SET IN THE SOUTHWEST HEADWALL TO A 4X6 FOOT BOX CULVERT, 18.5 FEET SOUTHWEST OF THE CENTERLINE OF THE EAST BOUND LANES OF U.S. HIGHWAY 290, AND 8.5 FEET SOUTHEAST OF THE NORTHWEST END OF THE RETAINING WALL."
The NGS description and associated reference points (i.e. distances/directions) are a good starting point for locating this station, however please note the following updates (as of the last recovery by a fellow geocacher back in 2007):
* US Hwy 290 has moved further up North, the referenced highway is now called "Old Hempstead Hwy", or "US Hwy BUS-290".
* The distance to the junction with Alliance St is actually closer to 0.41 miles (not 0.3 miles).
* There are actually 2 culverts present in the area; the station is located on the headwall of the NW set of culverts.
(See posted waymark's gallery images for BM close-up and setting details).
The most recently posted NGS Data Sheet's coordinates seemed to match reasonably well with my own personal observations, with just a 10ft difference: it states "N 30 03 19.53 W 095 55 19.21", which was in line with my findings as measured with 10' accuracy and 10+ reading averages: "N 30° 03.326 W 095° 55.322".
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Below are some additional facts, per the NGS database (with some editing for length): (
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BL1850 ***********************************************************************
BL1850 DESIGNATION - Y 1252
BL1850 PID - BL1850
BL1850 STATE/COUNTY- TX/WALLER
BL1850 COUNTRY - US
BL1850 USGS QUAD - WALLER (1980)
BL1850
BL1850 *CURRENT SURVEY CONTROL
BL1850 ______________________________________________________________________
BL1850* NAD 83(1986) POSITION- 30 03 19.53 (N) 095 55 19.21 (W) HD_HELD1
BL1850* NAVD 88 ORTHO HEIGHT - 74.26 (+/-2cm) 243.6 (feet) VERTCON
BL1850 ______________________________________________________________________
BL1850
BL1850_MARKER: DV = VERTICAL CONTROL DISK
BL1850_SETTING: 32 = SET IN A RETAINING WALL OR CONCRETE LEDGE
BL1850_SP_SET: HEADWALL
BL1850_STAMPING: Y 1252 1978
BL1850_MARK LOGO: NGS
BL1850_STABILITY: C = MAY HOLD, BUT OF TYPE COMMONLY SUBJECT TO
BL1850+STABILITY: SURFACE MOTION
BL1850
BL1850 HISTORY - Date Condition Report By
BL1850 HISTORY - 1978 MONUMENTED NGS
BL1850 HISTORY - 1986 GOOD NGS
BL1850 HISTORY - 19990715 GOOD USPSQD
BL1850 HISTORY - 20050912 GOOD GEOCAC