STATE OF IOWA 1 CONTENTS BASE LINE DESIGNATION STATE COUNTY QUAD AMES CBL (1992 REMEASURED) IOWA STORY N410934 POTTAWATTAMIE CBL (1992 REMEASURED) IOWA POTTAWATTAMIE N410953 1US DEPARTMENT OF COMMERCE - NOAA CALIBRATION BASE LINE DATA QUAD: N410934 NOS - NATIONAL GEODETIC SURVEY BASE LINE DESIGNATION: AMES CBL IOWA ROCKVILLE MD 20852 - AUGUST 28, 1992 PROJECT ACCESSION NUMBER: 17034 STORY COUNTY NEAREST TOWN: AMES LIST OF ADJUSTED DISTANCES (AUGUST 18, 1992) ADJ. DIST.(M) ADJ. DIST.(M) STD. FROM STATION ELEV.(M) TO STATION ELEV.(M) HORIZONTAL MARK - MARK ERROR(MM) 0 M 312.399 461 M 313.336 461.1988 461.1997 0.1 0 M 312.399 620 M 313.659 620.4288 620.4301 0.1 0 M 312.399 770 M 313.860 770.5867 770.5881 0.1 0 M 312.399 1370 M 314.894 1369.3327 1369.3350 0.2 461 M 313.336 620 M 313.659 159.2300 159.2304 0.1 461 M 313.336 770 M 313.860 309.3879 309.3884 0.1 461 M 313.336 1370 M 314.894 908.1340 908.1353 0.1 620 M 313.659 770 M 313.860 150.1579 150.1580 0.1 620 M 313.659 1370 M 314.894 748.9039 748.9050 0.1 770 M 313.860 1370 M 314.894 598.7461 598.7470 0.1 DESCRIPTION OF AMES BASE LINE YEAR MEASURED: 1982 YEAR REMEASURED: 1992 CHIEF OF PARTY: KM THE BASE LINE IS LOCATED ABOUT 12.2 KM (7.6 MI) NORTH OF SLATER AND 6.4 KM (4.0 MI) SOUTHWEST OF AMES. THE BASE LINE RUNS ALONG AND IS APPROXIMATELY PARALLEL WITH THE SOUTH EDGE OF A GRAVEL ROAD. THE BASE LINE IS AN EAST-WEST LINE WITH THE 0-METER POINT ON THE EAST END. IT CONSISTS OF THE 0, 461, 620, 770, AND 1370 METER POINTS. TO REACH THE 0-METER POINT FROM THE JUNCTION OF U.S. HIGHWAYS 30 AND 69, LOCATED ON THE SOUTHEAST SIDE OF AMES, GO NORTH ON U.S. HIGHWAY 69 (DUFF AVENUE) FOR 2.0 KM (1.2 MI) TO THE INTERSECTION OF LINCOLN WAY (THE MAIN EAST-WEST STREET). TURN LEFT AND GO WEST ON LINCOLN WAY FOR 5.6 KM (3.5 MI) TO THE INTERSECTION OF COUNTY ROAD R 38 (SOUTH DAKOTA AVENUE) ON THE LEFT. TURN LEFT AND GO SOUTH ON COUNTY ROAD R 38 FOR 1.6 KM (1.0 MI) TO THE NORTH END OF THE BRIDGE OVER U.S. HIGHWAY 30. CONTINUE SOUTH ON COUNTY ROAD R 38 FOR 1.6 KM (1.0 MI) TO A GRAVEL CROSSROAD. TURN RIGHT AND GO WEST ON THE GRAVEL ROAD FOR 0.22 KM (0.14 MI) TO THE 0-METER POINT ON THE LEFT. THE 0-METER POINT IS A STANDARD NGS CALIBRATION BASE LINE DISK STAMPED "0 M" SET IN THE TOP OF A 33 CM (13 IN) DIAMETER CONCRETE POST PROJECTING 5 CM (2 IN) ABOVE THE SURFACE OF THE GROUND. IT IS 6.0 M (19.7 FT) SOUTH OF, AND ABOUT LEVEL WITH, THE CENTERLINE OF THE GRAVEL ROAD AND 3.4 M (11.2 FT) NORTH OF A METAL WITNESS POST IN A FENCE LINE. THE 461-METER POINT IS A STANDARD NGS CALIBRATION BASE LINE DISK STAMPED "461 M" SET IN THE TOP OF A 51 CM (20 IN) DIAMETER CONCRETE POST RECESSED 5 CM (2 IN) BELOW THE SURFACE OF THE GROUND. IT IS 6.0 M (19.7 FT) SOUTH OF, AND ABOUT 0.8 M (2.5 FT) LOWER THAN, THE CENTERLINE OF THE GRAVEL ROAD, 5.0 M (16.4 FT) NORTHWEST OF A WOODEN POWER POLE, AND 4.1 M (13.5 FT) NORTH OF A METAL WITNESS POST IN A FENCE LINE. THE 620-METER POINT IS A STANDARD NGS CALIBRATION BASE LINE DISK STAMPED "620 M" SET IN THE TOP OF A 41 CM (16 IN) DIAMETER CONCRETE POST RECESSED 5 CM (2 IN) BELOW THE SURFACE OF THE GROUND. IT IS 5.9 M (19.4 FT) SOUTH OF, AND ABOUT 0.6 M (2.0 FT) LOWER THAN, THE CENTERLINE OF THE GRAVEL ROAD AND 3.9 M (12.8 FT) NORTH OF A METAL WITNESS POST IN A FENCE LINE. 1THE 770-METER POINT IS A STANDARD NGS CALIBRATION BASE LINE DISK STAMPED "770 M" SET IN THE TOP OF A 41 CM (16 IN) DIAMETER CONCRETE POST RECESSED 8 CM (3 IN) BELOW THE SURFACE OF THE GROUND. IT IS 8.5 M (27.9 FT) EAST OF THE CENTERLINE OF A GRAVEL DRIVE LEADING TO A RADIO TOWER, 6.2 M (20.3 FT) SOUTH OF, AND ABOUT 0.8 M (2.5 FT) LOWER THAN, THE CENTERLINE OF THE GRAVEL ROAD, AND 4.0 M (13.1 FT) NORTH OF A METAL WITNESS POST IN A FENCE LINE. THE 1370-METER POINT IS A STANDARD NGS CALIBRATION BASE LINE DISK STAMPED "1370 M" SET IN THE TOP OF A 30 CM (12 IN) DIAMETER CONCRETE POST PROJECTING 8 CM (3 IN) ABOVE THE SURFACE OF THE GROUND. IT IS 6.2 M (20.3 FT) SOUTH OF, AND ABOUT LEVEL WITH, THE CENTERLINE OF THE GRAVEL ROAD AND 4.0 M (13.1 FT) NORTH OF A METAL WITNESS POST IN A FENCE LINE. USER NOTES: CBL USERS SHOULD TAKE CARE IN PLUMBING OVER ALL POINTS. ELEVATIONS ARE FOR CBL USE ONLY. THE 0-METER POINT HAS BEEN DISTURBED. THE NORTH EDGE OF THE CONCRETE POST IS SHEARED OFF AND THE MONUMENT IS LEANING TO THE SOUTHEAST. THIS CALIBRATION BASE LINE WAS ESTABLISHED AND REMEASURED WITH ASSISTANCE FROM THE IOWA STATE UNIVERSITY. FOR MORE INFORMATION PLEASE CONTACT DR. K. JEYAPALAN, DEPARTMENT OF CIVIL ENGINEERING, SURVEY SECTION, IOWA STATE UNIVERSITY, AMES, IA 50011. TELEPHONE (515) 294-6324 OR 294-3532. OR CONTACT MR. DENNIS OBRIEN, OFFICE OF ROAD DESIGN, SURVEY SUPERVISOR, IOWA DEPARTMENT OF TRANSPORTATION, 800 LINCOLN WAY, AMES, IA 50010. TELEPHONE (515) 239-1209. 1US DEPARTMENT OF COMMERCE - NOAA CALIBRATION BASE LINE DATA QUAD: N410953 NOS - NATIONAL GEODETIC SURVEY BASE LINE DESIGNATION: POTTAWATTAMIE CBL IOWA ROCKVILLE MD 20852 - AUGUST 28, 1992 PROJECT ACCESSION NUMBER: 17034 POTTAWATTAMIE COUNTY NEAREST TOWN: CRESCENT LIST OF ADJUSTED DISTANCES (AUGUST 17, 1992) ADJ. DIST.(M) ADJ. DIST.(M) STD. FROM STATION ELEV.(M) TO STATION ELEV.(M) HORIZONTAL MARK - MARK ERROR(MM) 0 1983 299.009 150 1983 299.387 149.9879 149.9884 0.1 0 1983 299.009 430 1983 299.089 430.0034 430.0034 0.2 0 1983 299.009 1400 1983 299.021 1400.0075 1400.0075 0.2 150 1983 299.387 430 1983 299.089 280.0155 280.0156 0.1 150 1983 299.387 1400 1983 299.021 1250.0196 1250.0196 0.2 430 1983 299.089 1400 1983 299.021 970.0041 970.0041 0.1 A TAPE CALIBRATION MONUMENT WAS SET AT THE 100 FOOT POINT OF THE BASE LINE. THE REDUCED MARK TO MARK DISTANCE IS 99.99 FT. DESCRIPTION OF POTTAWATTAMIE BASE LINE YEAR MEASURED: 1983 YEAR REMEASURED: 1992 CHIEF OF PARTY: KM THE BASE LINE IS LOCATED ABOUT 10.0 KM (6.2 MI) NORTH-NORTHWEST OF COUNCIL BLUFFS, IOWA, 9.7 KM (6.0 MI) NORTH-NORTHEAST OF OMAHA, NEBRASKA, AND ABOUT 4.8 KM (3.0 MI) WEST OF CRESCENT. THE BASE LINE IS AN EAST-NORTHEAST, WEST-SOUTHWEST LINE WITH THE 0-METER POINT ON THE WEST-SOUTHWEST END. IT CONSISTS OF THE 0, 150, 430, AND 1400 METER POINTS WITH A PAIR OF STATIONS USED FOR 100-FOOT TAPE CALIBRATION LOCATED EAST OF THE 0-METER POINT AND SLIGHTLY OFF LINE. TO REACH THE 0-METER POINT FROM THE JUNCTION OF INTERSTATE HIGHWAYS 680 AND 29, LOCATED ABOUT 10.0 KM (6.2 MI) NORTH OF COUNCIL BLUFFS, GO WEST-SOUTHWEST ON INTERSTATE HIGHWAY 680 FOR 2.5 KM (1.6 MI) TO THE EXIT RAMP FOR A COUNTY ROAD (EXIT 1). TAKE THE EXIT RAMP AND GO WEST-NORTHWEST FOR 0.6 KM (0.4 MI) TO A STOP SIGN AND T-JUNCTION. TURN RIGHT AND GO NORTHERLY ON A GRAVEL ROAD FOR 0.10 KM (0.06 MI) TO A GRAVEL T-JUNCTION. TURN RIGHT AND GO EASTERLY ON THE GRAVEL ROAD FOR 1.2 KM (0.7 MI) TO THE 0-METER POINT ON THE RIGHT. THE 0-METER POINT IS A 5 CM (2 IN) BLANK BRASS DISK STAMPED "0 1983" SET IN THE TOP OF A 30 CM (12 IN) DIAMETER CONCRETE POST PROJECTING 15 CM (6 IN) ABOVE THE SURFACE OF THE GROUND. IT IS 10.0 M (32.8 FT) SOUTH-SOUTHEAST OF, AND ABOUT 1.5 M (4.9 FT) LOWER THAN, THE CENTERLINE OF THE GRAVEL ROAD, 2.0 M (6.6 FT) NORTH-NORTHWEST OF A METAL RIGHT-OF-WAY FENCE, AND 1.7 M (5.6 FT) NORTH- NORTHWEST OF A METAL WITNESS POST. THE 150-METER POINT IS A 5 CM (2 IN) BLANK BRASS DISK STAMPED "150 1983" SET IN THE TOP OF A 30 CM (12 IN) DIAMETER CONCRETE POST PROJECTING 13 CM (5 IN) ABOVE THE SURFACE OF THE GROUND. IT IS 10.2 M (33.5 FT) SOUTH-SOUTHEAST OF, AND ABOUT 1.5 M (4.9 FT) LOWER THAN, THE CENTERLINE OF THE GRAVEL ROAD, 2.0 M (6.6 FT) NORTH-NORTHWEST OF A METAL RIGHT-OF-WAY FENCE, AND 1.7 M (5.6 FT) NORTH- NORTHWEST OF A METAL WITNESS POST. THE 430-METER POINT IS A 5 CM (2 IN) BLANK BRASS DISK STAMPED "430 1983" SET IN THE TOP OF A 30 CM (12 IN) DIAMETER CONCRETE POST PROJECTING 20 CM (8 IN) ABOVE THE SURFACE OF THE GROUND. IT IS 10.6 M (34.8 FT) SOUTH-SOUTHEAST OF, AND ABOUT 1.5 M (4.9 FT) LOWER THAN, THE CENTERLINE OF THE GRAVEL ROAD, 1.8 M (5.9 FT) NORTH-NORTHWEST OF A METAL RIGHT-OF-WAY FENCE, AND 1.6 M (5.2 FT) NORTH- NORTHWEST OF A METAL WITNESS POST. 1THE 1400-METER POINT IS A 5 CM (2 IN) BLANK BRASS DISK STAMPED "1400 1983" SET IN THE TOP OF A 30 CM (12 IN) DIAMETER CONCRETE POST PROJECTING 10 CM (4 IN) ABOVE THE SURFACE OF THE GROUND. IT IS 20.7 M (67.9 FT) NORTH-NORTHWEST OF THE NORTH EDGE OF THE WESTBOUND LANES OF INTERSTATE HIGHWAY 680, 10.9 M (35.8 FT) SOUTH-SOUTHEAST OF, AND ABOUT 1.5 M (4.9 FT) LOWER THAN, THE CENTERLINE OF THE GRAVEL ROAD, AND 1.3 M (4.3 FT) NORTH-NORTHWEST OF A METAL WITNESS POST. THE 0-FOOT TAPE CALIBRATION STATION IS A 5 CM (2 IN) BLANK BRASS DISK STAMPED "100 FEET 1983 A" SET IN THE TOP OF A 25 CM (10 IN) DIAMETER CONCRETE POST PROJECTING 52 CM (20 IN) ABOVE THE SURFACE OF THE GROUND. IT IS 10.6 M (34.8 FT) SOUTH-SOUTHEAST OF, AND ABOUT 1.5 M (4.9 FT) LOWER THAN, THE CENTERLINE OF THE GRAVEL ROAD, 4.4 M (14.4 FT) EAST OF THE 0-METER POINT, AND 1.1 M (3.6 FT) NORTH-NORTHWEST OF A METAL RIGHT-OF-WAY FENCE. THE 100-FOOT TAPE CALIBRATION STATION IS A 5 CM (2 IN) BLANK BRASS DISK STAMPED "100 FEET 1983 B" SET IN THE TOP OF A 25 CM (10 IN) DIAMETER CONCRETE POST PROJECTING 45 CM (18 IN) ABOVE THE SURFACE OF THE GROUND. IT IS 10.5 M (34.4 FT) SOUTH-SOUTHEAST OF, AND ABOUT 1.5 M (4.9 FT) LOWER THAN, THE CENTERLINE OF THE GRAVEL ROAD AND 1.3 M (4.3 FT) NORTH-NORTHWEST OF A METAL RIGHT-OF-WAY FENCE. THE 100-FOOT TAPE CALIBRATION STATION WAS REMEASURED BY EDMI METHOD AND FOUND TO BE 30.477 M (99.99 FT) FROM THE 0-FOOT CALIBRATION STATION (MARK-TO-MARK DISTANCE). USER NOTES: CBL USERS SHOULD TAKE CARE IN PLUMBING OVER ALL POINTS. ELEVATIONS ARE FOR CBL USE ONLY. THIS CALIBRATION BASE LINE WAS ESTABLISHED IN CONJUNCTION WITH THE IOWA WESTERN COMMUNITY COLLEGE AND REMEASURED WITH ASSISTANCE FROM THE POTTAWATTAMIE COUNTY ENGINEERING DEPARTMENT. FOR FURTHER INFORMATION PLEASE CONTACT MR. JOHN MUNSON III, POTTAWATTAMIE COUNTY ENGINEERING OFFICE, 223 SOUTH SIXTH STREET, COUNCIL BLUFFS, IA 51501. TELEPHONE (712) 328-5608.