EJP County Line Bridge

Listed on the National Register of Historic Places in 1985.

From the record

“The EJP County Line Bridge is a Camelback pony truss bridge located near Hyattville, Wyoming, which carries Big Horn County Road CN9-60 across the Nowood River. The bridge was built in 1917 by the Monarch Engineering Company.”
Wikipedia article EJP County Line Bridge, CC BY-SA 4.0.

One of 16 National Register listings published here for Big Horn County · listed in 1985 · category: Structure.

Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service

The listing

What is counted as historic. The nomination lists 1 structure as contributing to the listing.
Address. Rd. CN9-60, Hyattville
When was it listed? February 1985
Category. structure
Also known as. Vehicular Truss and Arch Bridges in Wyoming TR
National Register reference number. 85000412 - the number the National Park Service assigned this property when it was listed, and the key its nomination file is catalogued under at the National Archives.

Fires near this property

18 since 1992

Regional context, not property-specific evidence. The federal wildfire occurrence database lists 18 fires within 5 miles of EJP County Line Bridge between 1992 and 2020, burning about 2,685 acres in total. 6 started naturally. None was recorded as arson. Distance is straight-line from the map coordinates, so a fire counted here may appear on a neighbouring settlement's page as well.

Reported cause	Fires
Natural	6
Missing data/not specified/undetermined	6
Equipment and vehicle use	5
Fireworks	1

The most recent of them, most recent first, with the day each was reported and the service that recorded it.

Date	Cause	Size	Reported by	Name on the report
8 August 2020	Natural	34 acres	Wind River / Bighorn Basin District	BOBCAT
27 August 2020	Missing data/not specified/undetermined	1.0 acres	Bighorn County	HAYSTACK
25 August 2011	Natural	412 acres	Worland Field Office	PAINT ROCK
22 August 1994	Missing data/not specified/undetermined	2.0 acres	Wyoming State Forestry	not named
2 August 2018	Missing data/not specified/undetermined	79 acres	Worland Field Office	LOWER NOWOOD
1 August 2018	Fireworks	under an acre	Bighorn County	2018-0022
8 July 2018	Natural	5.0 acres	Worland Field Office	APACHE EAST
5 July 2020	Equipment and vehicle use	7.3 acres	Wind River / Bighorn Basin District	31

Every fire recorded in Big Horn County

Mines and quarries near this property

5 within 5 miles

Regional context, not property-specific evidence. The federal mineral resources record lists 5 workings within 5 miles of EJP County Line Bridge: 3 unknowns, 1 occurrence, 1 past producer. None of them still produces. What was taken out: Uranium. Distance is straight-line from the map coordinates, so a quarry counted here may appear on a neighbouring settlement's page as well.

Site	Commodity	Status	Recorded
Scorpion Claims	Uranium	Past Producer
Unknown	Uranium	Occurrence	Stratabound
Unknown	Uranium	Unknown
Unknown	Uranium	Unknown
Unknown	Uranium	Unknown

Every working recorded in Big Horn County

Storms near this property

23 since 1998

Regional context, not property-specific evidence. The National Weather Service names Hyattville, the town this property stands in, in 23 storm reports between 1998 and 2025: 9 flood, 5 flash flood, 5 thunderstorm wind, 2 funnel cloud. No death or injury is recorded in these reports. Each account below is quoted exactly as the forecast office filed it, from the NOAA Storm Events Database, and each date opens the federal record of that event.

When	Event	Place named	Harm	What the report says
June 2011	Flood	Hyattville	$440,000	Medicine Lodge Creek rose rapidly during the early morning hours of Friday, June 24 as a result of snowmelt in the western Bighorn Mountains. The rising creek completely flooded the campground area and washed out portions of the main road at Medicine Lodge State Archaeological Site northeast of Hyattville. Water from the creek also ran down State Highway 31 which serves as Main Street in Hyattville. The basement of at least one home was inundated by flood waters from the creek. Officials dug a trench across the highway in Hyattville to relieve flood waters on the upstream side of the road. Flooding of agricultural land also occurred in areas between Hyattville and Manderson along the Nowood River and Medicine Lodge Creek.
May 2013	Flash Flood	Hyattville	$25,000	Heavy rain from thunderstorms brought flash flooding to the Medicine Lodge State Archaeological Site. Debris covered the main road leading into the park in several spots, occasionally to a depth of one to two feet. At least six campsites in the park were damaged when normally dry arroyos to the east of the park swept water and debris across them before emptying into Medicine Lodge Creek. One camper was damaged as mud and rock flowed against its sides. Rainfall estimates ranged from 0.50 inches to 1.25 inches in about 30 minutes.
June 2011	Flood	Hyattville	$25,000	Medicine Lodge Creek overflowed its banks for the second time in a week causing damage at the Medicine Lodge State Archaeological Site. Much of the site was flooded as waters surged down the narrow creek.
June 2015	Flash Flood	Hyattville	$5,000	Slow-moving showers and thunderstorms dropped heavy rain in a small drainage basin west of Medicine Lodge State Archaeological Site. Run-off in the basin fed a dry wash that brought water into the central portion of the park. The dry wash directed water into and around a newly refurbished small cabin that serves as a visitor center. There was minor damage to the park road.
July 2009	Thunderstorm Wind	Hyattville	$5,000	Several three-foot diameter Cottonwood trees were toppled at Medicine Lodge State Archaeological Site northeast of Hyattville.
May 2015	Flash Flood	Hyattville	$2,000	Heavy rain of one-half to one inch inundated dry washes and arroyos in and around Medicine Lodge State Archaeological Site. Water and mud flowing out of one small canyon caused damage to at least six campsites in the middle portion of the site.
May 2014	Thunderstorm Wind	Hyattville	$1,000	Thunderstorm outflow toppled two large trees at Medicine Lodge State Archaeological Site. The falling trees damaged a fence and narrowly missed a small cabin on the property.
June 2021	Flood	Hyattville	-	Please see episode for event description.
May 2019	Flood	Hyattville	-	Heavy rain caused flooding in portions of Medicine Lodge state park.
May 2018	Flood	Hyattville	-	The Medicine Lodge Creek rose to flood stage briefly on the morning of May 27th.
June 2018	Thunderstorm Wind	Hyattville	-	A severe thunderstorm produced a microburst that downed several hundred trees in the Bighorn National Forest. Wind gusts were estimated to be between 80 and 90 mph.
June 2015	Flash Flood	Hyattville	-	The superintendent at Medicine Lodge State Archaeological Site reported flooding of three dry arroyos in and south of the park. One arroyo flooded campsites in the middle campground and flooding of other arroyos covered sections of the last one-half mile of a road leading to the park.
May 2014	Flood	Hyattville	-	Flood stage of 3.5 feet on Medicine Lodge Creek within the boundaries of Medicine Lodge State Archaeological Site was topped beginning at 0300MST on Thursday, May 29. The water level generally stayed above flood stage through the end of the month. The creek crested at 4.07 feet at 0115MST on May 30, and nearly repeated the same feat the following morning reaching 4.06 feet. Peak water levels occurred between 0115 and 0345MST each day. State park employees sandbagged the creek and successfully protected the main road through the archaeological site. Some minor flooding of a few campsites did occur.
June 2014	Flood	Hyattville	-	The gauge on Medicine Lodge Creek in Medicine Lodge State Archaeological Site fell below flood stage of 3.5 feet at 0915MST on Sunday, June 1. A decreasing mountain snowpack and cooler air in the wake of a cold front brought an end to the snowmelt and flooding. The river ran high for roughly the first half of June but additional flooding did not occur.
May 2013	Funnel Cloud	Hyattville	-	A spotter posted a photo on Facebook of a funnel cloud as seen looking east from Hyattville.
August 2013	Thunderstorm Wind	Hyattville	-	A trained spotter estimated wind gusts of 60 mph.
August 2013	Hail	Hyattville	-	Wind-driven hail up to the size of pennies caused corn crop damage west of Hyattville.
May 2008	Flood	Hyattville	-	Both forks of Medicine Lodge Creek were out of their banks following heavy rainfall of around one-half inch which occurred in combination with snowmelt from the Bighorn Mountains.
May 2008	Hail	Hyattville	-	Penny sized hail occurred at the Medicine Lodge State Historic Site.
July 2025	Thunderstorm Wind	Hyattville	-	no account filed
June 2017	Flood	Hyattville	-	no account filed
May 1999	Funnel Cloud	Hyattville	-	no account filed
July 1998	Flash Flood	Hyattville	-	no account filed

Every storm recorded in Big Horn County

Map coverage status

No historic map-sheet match is published for this property yet. That does not mean no map exists. This record needs a coordinate-quality review before it can be joined to a sheet boundary. Browse the county's mapped places while that work is pending.

Sources for this property

National Archives record	The nomination case file for reference 85000412 in Record Group 79.
Wikipedia article	Community-written account of this property, licensed CC BY-SA.
Big Horn County	All 16 listed properties in this county.

Provenance

Listing record. National Park Service National Register of Historic Places, listed-properties dataset, current to 2026-05-22.
Map join. Address geocoded through the United States Census geocoder, then tested against the published boundary of every sheet in the USGS Historical Topographic Map Collection.
How this page is made. Listing fields come from federal records; map-sheet coverage is a labelled coordinate-to-boundary calculation, not a source-field claim.
Wildfire. Short, Karen C. 2022. Spatial wildfire occurrence data for the United States, 1992-2020 [FPA_FOD_20221014]. 6th Edition. Fort Collins, CO: Forest Service Research Data Archive. https://doi.org/10.2737/RDS-2013-0009.6 Collected with United States Government funding and usable without additional permissions or fees.
Mines and quarries. USGS Mineral Resources Data System (MRDS) https://mrdata.usgs.gov/mrds/ A work of the United States government, no copyright under 17 U.S.C. 105.
Storms. NOAA National Centers for Environmental Information, Storm Events Database https://www.ncei.noaa.gov/stormevents/ A work of the United States government, no copyright under 17 U.S.C. 105. Narratives are quoted verbatim from the National Weather Service report and are not edited or summarised.