The United States Geological Survey ( USGS ) states that a river's " length may be considered to be the distance from the mouth to the most distant headwater source ( irrespective of stream name ), or from the mouth to the headwaters of the stream commonly identified as the source stream ".

The United States Geological Survey ( USGS ) operates five stream gauges along the Rogue River.

Marys River then flows southeast by Philomath, which lies to its left ( north ), receives Newton Creek from the left, and passes a United States Geological Survey ( USGS ) stream gauge at from the mouth.

Continuing south and then west parallel to Upper Siletz Road, the river passes a United States Geological Survey ( USGS ) stream gauge and reaches Siletz at about RM 41 ( RK 66 ).

In a series of wide meanders starting at about RM 10 ( RK 16 ), the river turns away from the airport and flows under Route 18 for the sixth and last time at RM 5. 6 ( RK 9. 0 ), the site of a stream gauge maintained by the United States Geological Survey ( USGS ).

The United States Geological Survey ( USGS ) monitors the flow of the Trask River at a stream gauge inland from the mouth of the river.

The United States Geological Survey ( USGS ) monitors the flow of the Wilson River at a stream gauge from the mouth of the river.

The USGS stream gage on the North Fork Kern River has recorded an average annual mean discharge of and a maximum daily discharge of, and the gage on the South Fork Kern River shows an average annual mean of and a maximum daily discharge of.

The USGS has operated a stream gage downriver of Oroville Dam since 1902.

The USGS operates a stream gage above the mouth of the Queets, downriver from the mouth of the Clearwater River.

* USGS stream gage, Boise River at Glenwood Bridge near Boise

( This point is where USGS maps cease counting the mileage from the river mouth although the stream is listed on said maps as the Powell River from the point where it rises.

There are two USGS stream gauges on Noonday Creek, both operating since October 2000 and reporting via uplink to GOES weather satellites.

Since 1994, Nancy Creek has had a USGS stream gauge in the Paces neighborhood of Atlanta at West Wesley Road ( NANG1, ), with NWS flood stage being at that point.

The USGS stream gauge in Union, near the mouth of the river, measures an average flow of per second.

The Blue Earth River near the USGS stream gauge in 2007

The USGS operates several stream gages along the Santa Ynez river.

The USGS maintains a stream gauge at river mile 15. 8, just upstream from the Oroville-Tonasket Irrigation District canal intake.

* Bargh Glacier (), a glacier 6 miles ( 10 km ) long in the southwest part of Daniell Peninsula, 2 miles ( 3 km ) north of Langevad Glacier, whose stream it parallels, and flows southwest to enter Borchgrevink Glacier ; mapped by the USGS from surveys and U. S. Navy air photos between 1960 and 1964 ; named by US-ACAN for Kenneth A. Bargh, seismologist at Hallett Station, in 1958.

A USGS river gauge is located here.

Measured by a United States Geological Survey ( USGS ) gauge downstream of the Sandy's confluence with the Bull Run River, from the mouth, the river's average discharge is.

About further downstream, the river passes Dodge Park on the right, receives the Bull Run River from the right and passes a second USGS gauge at RM 18. 4 ( RK 29. 6 ). Sandy River headwaters Shortly thereafter, Walker Creek enters from the right.

Its mean annual discharge, as measured by USGS gauge 13075910 ( Portneuf River at Tyhee ), is, with a maximum daily recorded flow of and a minimum of.

* USGS page for Nancy Creek gauge at West Wesley Road

* USGS page for Nancy Creek gauge at Rickenbacker Drive

* USGS real-time gauge at Dahlonega

( 1908 )-Available online at this USGS webpage.

* The Parkfield, California, Earthquake Experiment at the USGS

* San Andreas Fault at Wallace Creek — Kite Aerial Photography from the USGS

The USGS also publishes 1: 100, 000 maps covering 30 minutes latitude by one degree longitude, 1: 250, 000 covering one by two degrees, and state maps at 1: 500, 000 with California, Michigan and Montana needing two sheets while Texas has four.

Image: Mount Marcy New York USGS topo map 1892. jpg | The Mount Marcy area of New York State in 1892 in a 15 minute quadrangle at 1: 62, 500.

Image: Mount Marcy New York USGS topo map 1979. JPG | The same area about a century later ( 1979 ) in a 7. 5 by 15 minute metric map at 1: 25, 000.

In other areas USGS digital map revisions may omit geographic features such as ruins, mine locations, springs, wells, and even trails in an effort to protect natural resources and the public at large, or because such features are not present in any public domain database.

According to the USGS Bostonia is located at ( 32. 8075509 ,-116. 9364153 ).

According to the USGS it is located at ( 32. 8072739-116. 8680800 ).

According to the United States Census Bureau Crest is located at ( 32. 805918 ,-116. 867405 ), approximately 500 feet to the southeast of the USGS location.

According to the USGS, Granite Hills is located at

According to the United States Geological Survey ( USGS ) Harbison Canyon is located at ( 32. 8203296 ,-116. 8300236 ), which is near the intersection of Harbison Canyon Road and Frances Drive.

The United States Geological Survey ( USGS ) places Spring Valley at ( 32. 7447740 ,-116. 9989160 ).

The United States Census Bureau places Spring Valley at ( 32. 734318 ,-116. 981372 ), which is approximately two miles southeast of where the USGS places it.

* Kerr Hill is identified as a populated place by the USGS GNIS at.

A USGS survey marker at the old Haywood County Courthouse in downtown Waynesville lists the elevation as above sea level.

* Other references embedded as external links include: Crary memoir, snowfall data, fossil evidence, USGS place names and locations, text of presidential speech at Lake Farmpark, April 15, 2005.

* Great Egret at the USGS

* Aerial view of the San Andreas fault in the Carrizo Plain, Central California, from " How Earthquakes Happen " at USGS

" at USGS

Seismic activity is monitored by the USGS Cascades Volcano Observatory located in Vancouver, Washington, which issues weekly updates ( or daily updates when significant eruptive activity is occurring at a Cascades volcano ).

* Northern Shoveler at USGS Patuxent Bird Identification InfoCenter

* Charles Richter interview, at USGS

Unfazed, Brady subsequently revised his forecast, stating there would be at least three earthquakes on or about July 6, August 18 and September 24, 1981, leading one USGS official to complain: " If he is allowed to continue to play this game ... he will eventually get a hit and his theories will be considered valid by many.