Cho Oyu | 2005 NW side

A USA expedition to Cho Oyu in 2005 via NW side, led by Les Vierra. Summit reached on 27th April 2005. 2 members recorded.

Expedition Details

Field	Value
ID	4870
Imported	2026-03-06 18:04:49.359634
Expedition ID	CHOY05130
Peak ID	CHOY
Year	2005
Season	1
Host Country	2
Route 1	NW side
Route 2	-
Route 3	-
Route 4	-
Nationality	USA
Leaders	Les Vierra
Sponsor	More than Mountain Two Cho Oyu Expedition (Monterosa permit)
Success 1	False
Success 2	False
Success 3	False
Success 4	False
Ascent 1	-
Ascent 2	-
Ascent 3	-
Ascent 4	-
Claimed	False
Disputed	False
Countries	-
Approach	-
Basecamp Date	2005-04-07
Summit Date	2005-04-27
Summit Time	-
Summit Days	20
Total Days	25
Termination Date	2005-05-02
Termination Reason	4
Termination Notes	Abandoned at 7140m due bad weather and lack of funds
High Point (m)	7140
Traverse	False
Ski	False
Paraglide	False
Camps	2
Fixed Rope (m)	0
Total Members	2
Summit Members	0
Member Deaths	0
Total Hired	0
Summit Hired	0
Hired Deaths	0
No Hired	True
O2 Used	False
O2 None	True
O2 Climb	False
O2 Descent	False
O2 Sleep	False
O2 Medical	False
O2 Taken	False
O2 Unknown	False
Other Summits	-
Campsites	BC(07/04),ABC(11/04,5750m),C1(16/04,6750m),C2(24/04,7100m),xxx(27/04,7140m)
Route Notes	High point at 7140m at bottom of seracs. 27th Vierra tried for top from C2. Brent had turned around from C2. Brent had turned around on 24th at 6800m at base of seracs and had to wait 2 hours for others ahead of them to go up (very slow people ahead). Reached there at 9:30 am NST and Brent doesn't like not being in control of his climb, so Vierra on to C2 alone. Vierra left C2 at 1:00 am on 27th but only 40m higher because snowfalling, foggy and in new snow could see not tracks to follow. So down to C1 alone and rejoined Brent at ABC on 28th. Had already decided on 24 April to make only one summit bid because of lack of funds.
Accidents	-
Achievement	-
Agency	More Than Mountain Treks
Commercial Route	True
Standard Route	True
Primary Route	False
Primary Member	False
Primary Reference	False
Primary ID	-
Checksum	2458913
Year	2005
Summit Success	False
O2 Summary	None
Route (lowercase)	nw side

Members

Field	Value
ID	37514
Imported	2026-03-06 18:06:05.675609
Expedition ID	CHOY05130
Member ID	02
Peak ID	CHOY
Year	2005
Season	1
First Name	Aaron Roy
Last Name	Brent
Sex	M
Age	0
Birth Date	-
Year of Birth	1973
Calculated Age	31
Citizenship	USA
Status	Climber
Residence	Aiguetonde, France
Occupation	Civil engineer
Leader	False
Deputy	False
Basecamp Only	False
Not to BC	False
Support	False
Disabled	False
Hired	False
Sherpa	False
Tibetan	False
Summit Success	False
Claimed	False
Disputed	False
Solo	False
Traverse	False
Ski	False
Paraglide	False
Speed	-
High Point (m)	False
Personal High Point (m)	6800
Summit Date 1	2005-04-24
Summit Date 2	-
Summit Date 3	-
Summit Time 1	-
Summit Time 2	-
Summit Time 3	-
Route 1	1
Route 2	0
Route 3	0
Ascent 1	0
Ascent 2	0
Ascent 3	0
O2 Used	False
O2 None	True
O2 Climb	False
O2 Descent	False
O2 Sleep	False
O2 Medical	False
O2 Notes	-
Death	False
Death Date	-
Death Time	-
Death Type	0
Death Height (m)	0
Death Class	0
AMS	False
Weather	False
Injury	False
Injury Date	-
Injury Time	-
Injury Type	0
Injury Height (m)	0
Death Notes	-
Member Notes	-
Necrology	-
Summit Bid	2
Summit Term	18
HCN	0
Checksum	2439948
Summit Note 1	-
Summit Note 2	-
Summit Note 3	-
Death Route	-
Name (lowercase)	aaron roy brent
Year of Birth	1973
Year	2005
Age at Expedition	32
Role	Member

Field	Value
ID	37515
Imported	2026-03-06 18:06:05.675609
Expedition ID	CHOY05130
Member ID	01
Peak ID	CHOY
Year	2005
Season	1
First Name	Leslie E. (Les)
Last Name	Vierra
Sex	M
Age	0
Birth Date	-
Year of Birth	1970
Calculated Age	34
Citizenship	USA
Status	Leader
Residence	Eden, Utah
Occupation	Civil engineer
Leader	True
Deputy	False
Basecamp Only	False
Not to BC	False
Support	False
Disabled	False
Hired	False
Sherpa	False
Tibetan	False
Summit Success	False
Claimed	False
Disputed	False
Solo	False
Traverse	False
Ski	False
Paraglide	False
Speed	-
High Point (m)	True
Personal High Point (m)	7140
Summit Date 1	2005-04-27
Summit Date 2	-
Summit Date 3	-
Summit Time 1	-
Summit Time 2	-
Summit Time 3	-
Route 1	1
Route 2	0
Route 3	0
Ascent 1	0
Ascent 2	0
Ascent 3	0
O2 Used	False
O2 None	True
O2 Climb	False
O2 Descent	False
O2 Sleep	False
O2 Medical	False
O2 Notes	-
Death	False
Death Date	-
Death Time	-
Death Type	0
Death Height (m)	0
Death Class	0
AMS	False
Weather	False
Injury	False
Injury Date	-
Injury Time	-
Injury Type	0
Injury Height (m)	0
Death Notes	-
Member Notes	-
Necrology	-
Summit Bid	4
Summit Term	3
HCN	0
Checksum	2438954
Summit Note 1	-
Summit Note 2	-
Summit Note 3	-
Death Route	-
Name (lowercase)	leslie e. (les) vierra
Year of Birth	1970
Year	2005
Age at Expedition	35
Role	Leader

2 recorded members.

Name	Sex	Year of Birth	Citizenship	Status	Residence	Occupation
Aaron Roy Brent	M	1973	USA	Climber	Aiguetonde, France	Civil engineer	Details Other expeditions
Leslie E. (Les) Vierra	M	1970	USA	Leader	Eden, Utah	Civil engineer	Details Other expeditions

References

0 recorded references.