The  Pennsylvania oil rush was a boom in petroleum production, which  occurred in northwestern Pennsylvania from 1859 to the early 1870s. It  was the first oil boom in the United States. The discovery soon fueled  refineries that were producing a new and highly coveted consumer  product: kerosene.
The  oil rush began in Titusville, Crawford County, Pennsylvania, in the Oil  Creek Valley when Colonel Edwin L. Drake struck rock oil there.  Titusville and other towns on the shores of Oil Creek expanded rapidly  as oil wells and refineries shot up across the region into Erie County.  Oil quickly became one of the most valuable commodities in the United  States and railroads expanded into western Pennsylvania to ship  petroleum to the rest of the country. 
By  the mid-1870s, the oil industry was well established, and the rush to  drill wells and control production was over. Pennsylvania oil  production peaked in 1891, and was later surpassed by western states  such as Texas and California, but some oil industry remains in  Pennsylvania. In fact, western Pennsylvania produced half of the world’s  oil until the East Texas oil boom in 1901.
During  the rush a great many test wells for oil were bored in Erie County,  nearly every area of the county had from three to half-a-dozen  exploratory drilling. With scarcely an exception, a small yield of oil  resulted, but not enough to encourage the belief that it would be found  in profitable quantities to extract. The most promising well though was  along Mill Creek, in the City of Erie. The Althof well in Erie produced  oil enough for many years to warrant the expense of pumping. The oil  that was gotten in the county was of the heavy kind used for lubricating  purposes. The Althof Oil Company, after operating for two years, having  struck oil at a depth of 700 feet, was producing about 6 barrels per  day, which was considered profitable then.
In  1860, Pennsylvania's first gas field was discovered in Erie County at  shallow depths along Lake Erie. The gas and oil wells of Erie vary in  depth from 450 to 1,200 feet. Natural gas was found almost everywhere by  boring. The wells put down for oil invariably yielded gas in a heavy  volume, and in Erie it was used in a number of instances for light and  fuel. Over the course of time, as the use of gas for street lighting  diminished, the wells lost their value.
Erie  City Iron Works, which became well known in the manufacturing world for  the quality and capacity of its engines and boilers, made the engine,  which drilled the first oil well near Titusville for Colonel Drake ;  also, the iron works erected the iron work and the stills for the first  oil refinery in Erie county, which was established at Corry.
In  1861, the two railroads then known as the Sunbury and Erie, and the  Atlantic and Great Western, crossed each other's rights of way in a  swamp that laid at the corner of Erie county, and had established a  little frame ticket office at the junction point, of a triangular form,  and was known as the Atlantic and Erie Junction. Little by little  other shanties were constructed in the vicinity, until a small huddle of  them was formed at the crossing. In October, 1861, the Atlantic and  Great Western Railroad Company purchased a small piece of land from  Hiram Corry, the owner of the tract about the junction, and General  Manager Hill was pleased to name the station for Mr. Corry. The little  buildings increased in number, spreading out along Main Street, and  better ones came to be built, until Samuel Downer, a wealthy Boston oil  operator and refiner, desired a location for a refinery near the oil  fields and which had the advantages of good transportation, believing he  would thus have a big advantage in the business. His agent, Mr. W. H.  L. Smith looked over the field, and selected the junction for the site,  purchasing fifty acres of Hiram Corry's lands for a mere trifle, and  secured Mr. Eugene Wright, of Boston, to lay out the tract in lots. This  occurred in the summer and fall of 1861. The Downer Oil Company built a  frame office building, a post office with Mr. C. S. Harris in charge  came to town, and a small refinery was put in operation, known as the Frenchman's. The following year came the erection of the Downer and  Kent Oil Works, the Boston Hotel, the Gilson House, and several  factories. Residences of a better architecture, together with the  ever-needful stores, were built. In 1862, another railroad was built to  Titusville and into the oil country, forming the gateway from the oil  fields to the outside world, and Corry grew quickly into a city.
Meanwhile,  early oil producers, in neighboring Warren County, had considerable  trouble moving their crude to market. Producers had to rely on hundreds  of teamsters to transport their filled barrels to the nearest railroad  shipping points. The only railroad within thirty miles of the first  wells was then known as the Sunbury and Erie and the western line ran  only from Warren to Erie County. On May 15, 1861, the newly built  Atlantic & Great Western Railroad met the Philadelphia and Erie line  at Corry, and this point soon became the intersection of the two great  oil-carrying trunk lines. In Warren County proper, oil from the wells  went by team to Garland and Pittsfield, both in Warren County, onto the  nearby Philadelphia and Erie Railroad line. Lesser quantities of  county-produced crude oil out of Warren went to Corry after May 15,  1861.
In  1862, Oil refineries began operating in Union City, creating a major  spike in property values. Prior to Drake's discovery of oil at  Titusville, the residents at Union City had been in the habit of  gathering the oil from the surface of the water from French Creek;  later, several wells were sunk there.
Like  many people, a young Frank Cleveland took advantage of the rush to oil  wealth, which by the 1870s was a stable business, and opened a refinery  in Erie. His oil venture lasted only a few years, but an ambitious  Cleveland looking for more opportunities would soon to be the impetus to  Erie’s most well-known manufacturers of engines and boilers.
The  rapid increase in demand for useful oil products, in the early case,  kerosene, led to more wells and a greater need for transportation of the  products to markets. Early transport by teamster wagon rapidly led to  the need for the development of pipelines. 1865 finally saw the  development of the oil pipeline gaining a solid footing in the  Pennsylvania oil region. Before then, of all the attempts to construct  pipelines, only 3 succeeded, one of the very first, that was successful,  was an 1861 line from a depot to a refinery in Erie.
Many  Erie citizens at the time bitterly recalled the narrow margin by which  Erie missed being the great oil refining center of the United States,  when the Standard Oil Company was seeking to locate large refineries on  the lake coast. Heman Janes was one of the hard workers who sought to  bring this large plant to Erie, and had his efforts been properly  supported, without opposition, the City of Erie would have been the big  oil refining center, instead of Cleveland.
Pennsylvania  oil production peaked in 1891, when the state produced 31 million  barrels of oil, 58 percent of the nation's oil that year. But 1892 was  the last year that Pennsylvania wells provided a majority of the oil  produced in the United States, and in 1895, Ohio surpassed Pennsylvania  as an oil producer. By 1907, the decline of the Pennsylvania fields and  the great discoveries made in Texas, California, and Oklahoma, left  Pennsylvania with less than ten percent of the nation's oil production.
By  1901, the Pennsylvania oil boom was over. The formation of the Standard  Oil Trust in 1882 effectively established a monopoly over the industry  in Pennsylvania. The state continued to be a significant producer of  petroleum for much of the 20th century, but Erie and Crawford counties  had been permanently eclipsed.
From  1893 to 1906, Ida Tarbell, from Erie, worked for the publisher S.S.  McClure as a feature writer and editor of McClure's Magazine. It was  during this time that she published her History of the Standard Oil  Company, a muckraking account which brought her to the forefront of her  profession. Marianne Moore, who was educated at Bryn Mawr College and  taught at the United States Indian School in Carlisle, was a famous poet  and the winner of many international awards.
Though  the oil boom went bust and the oil industry bypassed Erie County, the  infusion of capital made off of the boom provided the county with an  opportunity to grow its emerging manufacturing business.