Geophysical Investigations at Two Residences Associated with Ulysses S. Grant in St. Louis County, Missouri

The project consisted of geophysical investigations at the Hardscrabble residence (23SL1223) at the cemetery on St. Paul Churchyard and the Wish-ton-wish residence (23SL1222) on Anheuser-Busch’s Grant’s Farm. At Hardscrabble, the geophysical investigations included magnetic gradient, conductivity, and ground-penetrating radar surveys. A total area of 6,400 square meters was investigated including 4,800 square meters with fluxgate gradiometer, 2,000 square meters with a ground conductivity meter, and 400 square meters with a ground-penetrating radar cart system with a 400 mHz antenna. The results of the magnetic gradient survey indicated a roughly triangular area in the open grassy lawn adjacent to Rock Hill Road. Within the triangular area of magnetic anomalies, a rectangular depression was noted in one of the grid units, which may have been the location of the log cabin built by Ulysses S. Grant. Conductivity and radar data provided additional information on the nature of selected portions of the site.

Wish-ton-wish was located in the ostrich and aoudad pens on Grant’s Farm. At Wish-ton-Wish, the geophysical investigations included resistance and ground-penetrating radar surveys. A total of 1,625 square meters was examined with the resistance system using a twin probe array and a ground penetrating radar cart system with a 400 mHz antenna. The remains of the stone foundation of the residence were clearly visible in both data sets along with a well which may be associated with the residence. Although some foundation stones were visible on the surface, the geophysical data also suggested the location of the attached porches to the residence. In addition, both data sets indicated the presence of a lane around the residence foundation and a possible out building associated with the residence.

Based on the evaluation of the geophysical data collected at both sites, it is recommended that both sites be considered eligible for inclusion on the National Register of Historic Places.

本项目针对两处遗址开展地球物理勘探：一处为圣保罗教堂墓地墓园内的哈德斯克莱布尔（Hardscrabble）宅邸（编号23SL1223），另一处为安海斯-布希（Anheuser-Busch）格兰特农场内的威什顿威什（Wish-ton-wish）宅邸（编号23SL1222）。

针对哈德斯克莱布尔宅邸的勘探涵盖磁梯度法、电导率法与探地雷达（ground-penetrating radar）勘测。本次总勘探面积达6400平方米，其中4800平方米采用磁通梯度计（fluxgate gradiometer）开展磁梯度勘探，2000平方米通过地面电导率仪完成电导率探测，另有400平方米搭载400兆赫兹（400 mHz）天线的探地雷达车载系统实施探地雷达扫描。磁梯度勘探结果显示，在毗邻罗克希尔路（Rock Hill Road）的开阔草坪区域内存在一处近似三角形的磁异常区。在该磁异常三角形区域的一个网格单元中，发现一处矩形凹陷，此处或为尤利西斯·S·格兰特（Ulysses S. Grant）所建原木小屋的原址。电导率与探地雷达数据进一步揭示了该遗址部分区域的地层特性。

威什顿威什宅邸位于格兰特农场的鸵鸟与蛮羊围栏区域内。针对该宅邸的地球物理勘探包含电阻率法与探地雷达勘测。本次共勘探1625平方米，其中电阻率勘探采用双探针阵列系统，探地雷达勘探搭载400兆赫兹天线的车载系统完成。两组勘探数据均清晰识别出该宅邸石质地基的残存结构，以及一处疑似与该宅邸相关的水井遗迹。尽管部分地基石块已裸露于地表，但地球物理数据还进一步确定了该宅邸附属门廊的位置。此外，两组数据均显示在宅邸地基周边存在一条通行小径，以及一处疑似与该宅邸相关的附属建筑。

基于对两处遗址采集的地球物理数据的综合评估，建议将两处遗址纳入《国家历史遗迹名录》（National Register of Historic Places）。