At around 10am on Saturday July 4, Lincolnshire Police received a report of a body in the water at the reservoir.
A police spokesman said: "Following a call from a member of the public our officers attended near to the boathouse at Covenham reservoir.
"Our under water search team recovered the body of a women, from the water, she was sadly confirmed dead at the scene.
"The women has been identified as Patricia Hamilton-Wright, she lived locally in the Louth area.
Mrs Hamilton-Wright arrived at the reservoir driving a green blue/grey Peugeot Partner vehicle around 6.30 am on Saturday July 4.
"She is described as being 5ft 2in tall, in her 70s, of medium build, with grey hair, and wearing a burgundy anorak with a hood, burgundy trousers, and black shoes.
DS Sim, Skegness CID (Lincolnshire Police) said: “As part of my investigation I would like to speak to anyone who was in the area of the reservoir between 6.30am and 10 am.
"I’d really like to speak to anyone who saw the lady arrive in her car or saw her at the reservoir any time until we were called at 10 am.
"I’d also like to speak to anyone who may have seen her in the area overnight. We believe she will have been driving or parked her vehicle, a blue/grey Peugeot Partner in the local area, before visiting Covenham resevoir.
“I don’t believe there is anything suspicious or untoward. We are making inquiries on behalf of the coroner, and I would like to be able to find out any information that will help me complete our inquiries.”
Police would like to hear from you if you have any information that could assist the inquiry. There are a number of ways you can report:
• By sending an email to: [email protected] - remember to put the reference Incident 87 of 4th July in the subject box.
• Via the non-emergency number 101, quoting reference Incident 87 of 4th July.
• Through the independent charity Crimestoppers anonymously on 0800 555 111 or online at crimestoppers-uk.org.